A friend just sent me this link, it's a pretty nifty way to search for images across multiple sources:
Edit: Here's a little blurb I found about the site's purpose:
This in combo with Piclens is pretty cool.This is a licensing and payments application that enables original content owners on large sharing sites like Flickr to license their work for use as stock photos -- making approximately 1 billion images searchable by potential image buyers. So for those of you who have lots of photos and are interested in making them available for people to license as stock photography, this is an easy way to do it. And for those of you looking for stock photography, the photo search engine is pretty cool...