I discovered it recently and I have to say that while on the #1GAM IRC channel I've been more motivated to focus on making a game than I ever have before, the idea is that you every month you submit a (complete) game for as long as possible, in any language with any tools and of any sort you like.
Has anyone else here signed up or submitted a january/february game? I'm still working on my february one.
Heard of it, Moosader.com has even started something similar because of that site. I would love to do it, but because of my issues with design I feel I couldn't do it in a month though :(.