Yahoo! microblogging site me.me

Great idea. I created my own meme at Bleeding Purple

Find visually similar images - www.tineye.com

I had a visually stunning image of some water body and didn't know what was it. I went to http://www.tineye.com/ and uploaded the image. Saw similar images at other places and figured out it was a salt marsh. This is a very interesting service. Google and other search engines offer to find similar images but only from what they display and you can't upload your own. tineye has done a great job.