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Zephyros

I hope this is the right place for this, I'm not advertising anything of mine here, but if it is in the wrong place, Moderators please move to where it's more appropriate (the media forum didn't "feel" right)

Anyway, sometimes people post here looking for a deck from a card they saw and don't know which deck it's from. One of the things that help me is this site

http://www.tineye.com/

which is kind of like a reverse telephone search, but with pictures. The results aren't always great, but sometimes they're spot on.
 

Alta

I have used that as well, it is a very helpful function.
 

celticnoodle

ditto. I also use it. Its a great site. :)