The first known malware worm for the iPhone is targeting jailbreakers running SSH and default root passwords, "rickrolling" vulnerable iPhones by replacing the wallpaper image with an image of '90s pop star Rick Astley. The image also includes a boast that hacker "ikee" is "never gonna give you up." While the hack is apparently harmless, it serves as another reminder of the potential security vulnerability that jailbreaking can cause.

Unlike the hack we reported last week, this malware can spread itself to other vulnerable devices that are accessible to an infected phone. The worm scans the network, looking for jailbroken phones with an open SSH port and attempts to use the default passwords. At least four variants exist in the wild, the latter of which makes an attempt to hide itself by burying the code in a filepath that looks like the path for Cydia, a jailbreak app installer.

We gave you the lowdown on how well Apple's new Magic Mouse works, told you about a Dutch teen that used port scanning to find vulnerable jailbroken iPhones, showed how less-than-honest iPhone developers claim to have developed others' apps, and how Apple may or may not be dropping support for Atom processors. If you missed any of that, here's a look at top Apple-related stories this week.

Indie Mac developer Daniel Jalkut of Red Sweater Software has been highly critical of the now-perennial MacHeist promotion in the past. MacHeist relies on deep discounts and giveaways to drum up a wider audience for software. The deals are so good for consumers, in fact, that it's not too far from getting software with a "five-finger discount." So Jalkut enlisted other like-minded developers to offer "One Finger Discount," a 20 percent-off sale coinciding with MacHeist's latest nanoBundle promotion.

MacHeist's promotion is a selection of six Mac apps, including WriteRoom and Twitterrific, that have a combined retail value of $154. For one week only, these apps are available for free. While the promotion offers a lot of exposure for smaller, independent developers, developers end up with lots of customers and not much money. It also has a potential downside in that it could give users the notion that software should cost next to nothing.

Windows 7 arrived two weeks ago and so far it's selling quite well. With Mac OS X 10.6 becoming available less than three months ago, and Ubuntu 9.10 arriving last week, we feel it's a good time to start watching the market share for operating systems, in addition to our monthly posts on browser market share. At this point in time, Windows continues to dominate with more than 90 percent of the market, Mac OS is above the five percent mark, and Linux is just under one percent. In October, Windows was the only operating system not to show positive growth.

If you follow the rules, finding images for presentations, blog posts, or even print can be difficult. You have to worry about licenses, attribution, and finding an image that is large enough to fit your needs. At Ars we know a little something about this—we use a lot of images and do a lot of searching and sifting. Many times we come up empty handed. The problem isn't that there is a lack of content—it's finding content that we can safely use. Most Web-based searches aren't very good; they offer a limited number of results per page, finding different sizes can often take multiple clicks, and getting attribute information is often a copy and paste nightmare.

Viewfinder, a new application from Connected Flow, aims to make the entire process easier, and I'm happy to say it does. While there are lots of places to find images, Viewfinder only makes use of one source: Flickr. This may be less than ideal for some, but Flickr has a plethora of content, and for most, will have something they can use.

Parallels has announced that the fifth version of its x86 virtualization software, Parallels Desktop 5, is now shipping for Mac OS X. Like competitor VMware's Fusion 3, it adds support for running on Snow Leopard and hosting Windows 7 on a virtual machine. However, independent benchmarks show that Desktop 5 still retains a performance lead, specially in 3D graphics performance.

The latest version of Parallels' solution to run Windows on a Mac—hey, it runs Linux just fine, too—boasts 70 new features, most of which are related to OS integration and speed improvements. Users can now choose from several levels of running a VM, from full-screen all the way to a "Crystal Mode" enhanced Coherence, where Windows applications integrate with running Mac OS X applications, similar to the way Classic worked for Mac OS 9 applications. It also adds support for multi-touch gestures in Windows, format-retaining copy & paste (with images) between Mac and Windows, copy & paste support for Linux VMs, "true" multi-monitor support, and an always-on Windows application folder in the Dock for quick access.

Apple CEO Steve Jobs is no stranger to accolades. At the ripe old age of 30, he—along with Apple cofounder Steve Wozniak—won the first National Medal of Technology. Most recently, he was named the most admired entrepreneur among teenagers. He is admired by geeks and businessmen alike, and his successes (and failures) with Apple, NeXT, Pixar, and Apple again fill the pages of numerous books. Given Apple's meteoric rise from near-bankruptcy in 1997 to the technology leader that everyone is trying to follow today, is it really much of a surprise that Fortune has dubbed Jobs "CEO of the Decade?"

Jobs became a wildly successful businessman in his late 20s and early 30s as Apple rose to prominence as an early leader in home computing. However, there are numerous anecdotes of his petulant behavior that ultimately resulted in his ouster from the company he helped found in 1985.

Let's face it: sometimes planning travel can be a pain in the butt. Not only that, but actually going through with them—getting to the airport at the right time, catching your connecting flight at the right time, getting to the right hotel, etc.—can be equally frustrating if all your information is scattered across different e-mail accounts on different computers. Who here has sat down the night before you're supposed to leave (or an hour before—we know you people exist) and think "So, what time do I leave again, and where am I staying?" I'm no power traveler, but as someone who has flown either for business or pleasure six times this year with three more trips to go, I'm getting frazzled just writing about it.

Sure, some travel sites are making it easier to keep track of the things you have booked. You can log into Travelocity or Orbitz to check up on your itinerary—assuming you booked your entire itinerary there, or that you even remember you booked your flight there in the first place. And even then, that doesn't address the maps you might need to generate (even if only on your phone) when you get there. You may think these people don't exist, but not only do they exist among our readership, they exist within the Ars staff as well. Clearly, travel can be quite an affair to the too-busy person.

That's why I started using a service called Tripit. Launched in 2006, Tripit's entire goal is to simplify the process of organizing and going through with your travel plans, and in doing so it has saved my sanity.

We reported earlier this week that Apple had seemingly dropped support for Intel's Atom processor from the most recent developer seed of Mac OS X 10.6.2, leading some to speculate that Apple did so to thwart some users from running the operating system on non-Apple hardware. We thought that Apple's move wasn't malicious in intent, but more likely related to code optimization. Still, the news left many Netbook users running Snow Leopard fearing the worst. It was truly a "here today, gone tomorrow" scenario.

The source of the news, who was quite surprised that their post received all the attention it did, is now reporting that the most recent build of OS X 10.6.2, 10C535, has seen the rise of Atom support from the ashes like some sort of software phoenix. That's right, everything is back to normal, nothing to see here, everyone can go back to running Mac OS X on their underpowered baby laptop.

Apple has announced that it has finally accumulated over 100,000 apps available to download for iPhone OS devices. This feat was accomplished just 16 months after Apple opened the App Store alongside the launch of iPhone OS 2.0 and the iPhone 3G in Summer 2008.

"The App Store, now with over 100,000 applications available, is clearly a major differentiator for millions of iPhone and iPod touch customers around the world," said Apple SVP of Worldwide Product Marketing, Philip Schiller, in a statement. "The iPhone SDK created the first great platform for mobile applications and our customers are loving all of the amazing apps our developers are creating."