I've just signed up for 3 book challenges so far.
The first is the GLBTQ challenge for 2010 with Amanda.
And on Becky's Book Reviews http://blbooks.blogspot.com/
I have signed up the Arthurian Challenge 2009-2010 (April - March) and this is one of my very favorite subjects.
I also signed up for the Celebrate the Author Challenge 2010.
So we shall see how it goes. Wish me luck!