Omnivorous Surfer

I personally can find at least a couple of uses for iStockphoto, and I think many others can as well. Once you join, you can use all kinds of royalty-free files: stock photography, vector illustrations, video footage, audio tracks, and Flash(r) files. This could be a great source of free graphics for teachers and students. In addition you can purchase photos uploaded by approved contributors if you wish.

You can also upload your own photos and, by meeting the requirements to be a contributor, you can sell your photos. I found this site while perusing a photographer's blog and then viewing his photos. Enjoying photography--taking as well as viewing photos--I'll have to be careful not to spend too much time at iStockphoto!