1. Google Image Search Match
When you're doing an image search in Google, see that little blue camera there? Did you think it was just for fun, like me? If you click on it, you can upload or otherwise select an image of your own and then ask Googles Image Search to find any matching or near matching images. Cool ey? Uses? Er, I dunno, but it's fun! I guess if you were a photographer, you could use it to check if your pics are being used elsewhere or if you had a pic and you wanted to find the original source. If it can't find an exact match, the near matches it suggests can be amusing. It's a Google search after all.
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