I really like Flickr. I've heard of it a lot, but never used it before. Even if you're not putting pictures on it, it's really fun just to look at the populart tagged pictures; there's some really cool stuff out there! I think it would be neat to use a site like this if maybe your library was doing remodeling or something like that, you could put pictures out there for the patrons to see. That would be pretty neat. It would also be cool to have pictures of programs as long as you watched out for minors being able to be identified.
I choose this picture off Flickr because I really like running and would love to go watch (and MAYBE run one someday)