I've already announced that I'll be taking part in the 2010 YA debut author challenge but since then I've decided to do a few more.
YA Reading Challenge hosted by J. Kaye's Book Blog:
I'll be doing the "stepping it up" section that requires 50 YA novels be read. I usually average more than 50 but with the other challenges I didn't want to be too ambitious.
Support Your Local Library Reading Challenge also hosted by J. Kaye's Book Blog:
I'm at the library all the time so why not join a challenge for it?
100+ Reading Challenge, again, hosted by J. Kaye's Book Blog:
I participated in this one in 2009 and it was so much fun I wanted to continue it in 2010!
There are probably official ones but I'm doing these just for myself even though I didn't sign up anywhere:
-Nonfiction challenge (at least 5)
-Classics challenge (at least 5)
What challenges are you participating in?