Having mentioned the content-aware fill for Adobe CS5, I just had to mention the equivalent feature on the free GIMP.
There is a pretty cool video that is similar to the CS5 one:
You can see instructions on how to use it on Windows, as well as another demo here (blog post gone, link removed).
Featured Software Print your Folders quickly
Print and visualize your folders. Find out where your hard drive space went – and all your hard to find junk files.
Save money by avoiding buying a new hard drive, when all you had to do was delete files you didn't even know you still had!