Okay, so a while back at this conference called SIGGRAPH (a yearly thing for computer graphics) a team presented something they called Content Aware Image Resizing. You can see a youtube video of the thing here. They basically came up with a way (or several ways) of having a computer slice parts of an image away when resizing so the important bits don't get resized, and unimportant parts get removed.
And now there's an online version called rsizr. Open up a picture, and watch the (slow) magic.
If you're really interested in this thing, this page has links to the paper where the technique is described in detail as well to plugins for GIMP and Photoshop (that one is crippled unless you pay teh big monies though), and actionscript source code.
wow, that's clever.
Another clever online image manipulation tool: VectorMagic. Turns a bitmap into a vector image. If you don't know what that means, go to the site, it will explain.
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