Not MY top 10, but someone's top 10 (I agree with their #1, though).

http://photoravlik.blogspot.com/2006/11/top-ten-places-to-find-free-images-for.html

Yes, stock xchng is excellent. I also like <a href="http://yotophoto.com/">YotoPhoto.com</a>. It's kind of a search engine for free stock photos and will return hits from a variety of stock photo sites.

Sorry about the horrible HTML. Now, let me figure out how to do this.

I think I found the magic. I hope. http://www.yotophoto.com/