McKoala has the 2011 challenge page posted -- head over and comment to sign up. An explanation of how it all works and how to earn points is on the linked page.
I had a lot of fun with it last year, even the [mumblecough] months when I pretty much flaked out, and found it helped me with my writing, and particularly with my submissions. If you're motivated by this sort of month-by-month challenge then I highly recommend this one. :)