Some time ago I wrote about seam carving, an improved method of resizing images whilst maintaining the content of the image. Now there is a web based tool created in Flash called rsizr. This tool allows you to use the seam carving, re targeting algorithm on your own images. Its a bit slow and I would love to have this as a desktop tool, which lots of people seem to be working on with no real result for OSX yet.
What I find particularly impressive is how quickly this resizing technique has gone from being a research paper to a useable web application. All too often you see a cool demonstration of a technology at a confernce and you have completely forgotten about it by the time you can actually get your hands on it.
A nice example of retargeting/image carving at work
Give it a go over at rsizr