Mario. Remember Wii sales are limited by supply at the moment, even now, so the sales rate will only increase when units become availible. If Halo 3 is slightly more popular on the 360 as Galaxy is on the Wii, which I expect due to the nature of the audience, this still means Galaxy will win by a significant margin as current trends continue or even diverge.
Ubuntu. Linux for human beings.
If you are interested in trying Ubuntu or Linux in general, PM me and I will answer your questions and help you install it if you wish.