Scrapblog create your own online scrapbooks, awesome!
bigHugeLabs you can do all sorts of effects to your snapshots
Dumpr another site with a whole host of effect filters
Photojojo The best photo tips, DIY projects, and gear in the whole wide world
ShapeCollage Free photo collage maker that allows you to even make them in custom shapes
Picnik photo editing site. There are free options as well as advanced items with a paid subscription