Okay, hopefully everyone here knows about word association. This is just like that, except with pictures. Instead of coming up with a word in response to another word, you post pictures!

If you want to use a picture from a place which doesn't like hotlinking, or you just want to be nice and not use up lots of bandwidth from the place you stole the picture from, or you just need some quick image hosting, try Imageshack. You don't need to register or anything, you don't even need to keep a fake email address handy, just give it a file, or an URL and it will be magically hosted (and you can even get the image resized, which is handy if the original is large).