Flickr...

I "putzed" around at Flickr and was really impressed with the organization of photos and the ease of placing them on my Blog! I compared my "old way" of finding an image.... Dogpile search engine... and actually found more images there. I'm guessing you need to get good at refining your search @ Flickr to get bettter results.
I like knowing what's out there and how far I can "raise the bar" for my student's blogs!