I've signed up for the write-a-game-in-48-hours competition that'll start at around 1pm our time (that's GMT+11 at the moment) next Saturday.
I only just missed the last one, and this time I have some further familiarity with pygame. I'd like to try out the sprite handling library code before the weekend too, but should be ok even if I have to wing it. Pygame's pretty simple to use. The hard part for me will be the graphics.
We've started voting on the theme (ideas for which came from a prior discussion) - Sheep and Zombies seem popular judging by the comments (sorry, you'll need a login to see that one).