This is a pretty cool website!
It lets you resize pics… nothing new about that in itself… but it does it by identifying the areas of your pic with the least detail, and removing those to make smaller, or duplicating them to make larger… so basically it ends up making the primary parts of your picture either closer together or further apart.
(Watch the video link on the page and it makes more sense.)
Cool toy to play with. Not sure I would really use much in general, but fun to mess with.