Seam Carving GUI is a freeware utility which allows you to resize an image while retaining the aspect ration of a specified area.
A similar functionality is built into Photoshop CS4 but for those who can't afford the upgrade (me included!), this could come in quite handy on the odd occasion when I need to fit an image into a space that's the wrong size.
Obviously it won't work for all images, but an example where it would work quite nicely is where you've got an area of background (sky, water, or something where a bit of stretching won't be obvious) that can be resized, while maintaining the proportions of the main subject.
It is possible to approximate this sort of effect by selecting an area of an image in Photoshop and resizing that part, but this tool is a bit more intelligent, allowing you to select irregularly shaped or multiple areas.
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