If you haven't heard of Flickr, it's a photo-sharing site that - pretty obviously - allows users to upload photos and share them with the world.
One of the cool features is that you can tag photos with descriptions so others can easily find them.
Check out this slideshow of over 4,000 pictures tagged "GWU." Or this one of photos tagged "George Washington University."
It's a great source for pictures for blog posts and the like (just make sure you have the photographer's permission first).
Thanks to alex-s for this sweet shot of a snowy Gelman.