Web 2.0 Sites

I like all of the widget sites, because I like widgets. There are a couple really fun ones, like the radio and the snowglobe on Yourminis. Anyway, yeah, these are fun, but there aren't a lot that are useful, most are just silly or fun. Or both. I could see myself using these for a little while for a time, but eventually stopping, because I would be done with them. It's hard to see these really being useful for a library, but if someone came out with a Useful-for-a-library widget, well then maybe.