imgfave is delicious.com for images. Bookmark the images you like and come back to them later. It's perfect for saving design and fashion inspiration, funny images, and anything else you enjoy. Like delicious, imgfave gives you your own webpage filled with the things you've saved, so that you can share them with friends.
WARNING: imgfave can sometimes (but not always) become a stockpile of softcore porn, depending on what other users decide to "fave." Don't visit imgfave at work or with your grandparents.
imgfave is a more accessible knockoff of ffffound, the latter of which is an elite image-bookmarking website popular among professional designers. Images on ffffound tend to be a great deal more lovely than those on imgfave, but ffffound is invite-only, while anyone can start an account on imgfave.
Here's a link to my imgfave.