I got this from walkalong, and the letter I got is Y.
SOOOOoooooo.... In no particular order:
1) Yo La Tengo -
One of the baddest and bitchinest bands out there. Not surprising that they made the list.
3) The Yes Men - both the movie and (especially) the performing/activist group.

4) You. Yes, you! You know who you are.
5) Yo Yo Ma - Cellist extarordinaire. Great work in many genres.
7) 92nd Street Y - Cultural center, community center, performance space, important to New York. I've performed there, and I've seen and heard LOTS of good stuff there. Did you know that this is a YMHA, not a YMCA? You probably did.
8) Yoga - Sure, I don't practice as often or as intensely as I could, but I love it nonetheless. My daily practice has slipped to the wayside the last couple weeks. Maybe this list will spur me to get back into that.
9) Y chromosomes - You know, those little microscopic things that pair up with X chromosomes to make a person a boy instead of a girl. I wouldn't say that I prefer Y to X inherently, but let's take this opportunity to celebrate maleness.
10) Yoni - Let's take this opportunity to celebrate femaleness. I think it's fair to acknowledge a love of Yoni. Not all Yonis. And NOT Yanni. But, the idea of Yoni, the right Yoni, the Yoni for me, yeah, we can celebrate that.
This installment has been brought to you by the letter Y.