What are some good volunteer websites?

I am playing with a few ideas right now: - volunteer to teach piano - volunteer to teach yoga*** this is one I would really like to do, but I'm having difficultly finding a place to this. I am seeking an opportunity for about 1-3 months longs

I recently graduated college and I want to eventually apply for AmeriCorps. I live in ohio and I wanted to get some volunteer experience.

I live in the silicon valley and would really enjoy helping my community. (umm, also, I kinda need volunteer credits for school.)

Are there any good websites to look for volunteer opportunities or activities in a certain area? Other than meetup.com? Thanks!

Hi, looking to volunteer or preferable work abroad (outside northern America would be nice...) starting July 2011 and going indefinitely... I'm getting bogged down by all the research I've been doing, and I'd like to spend less time opening link after...

Looking for a one time volunteer opportunity for Dec. 11 in Oakland for a group of 20 people. lol, where can I find some search engines to look for opportunities?

I'm a young professional interested in doing a "volunteer vacation" abroad, and am not sure where to start. Looking for something a) Safe b) In an interesting locale/country c) Makes a real impact- open to anything from building houses to teaching...

What are other examples of interactive - "volunteers needed" type websites like WheresGeorge.com, CoCoRaHS, BOINC, Folding@home, Geocaching, BookCrossing?