oh, almost forgot to mention this: have you played
teewars???? just stumbled upon it a few days ago at ubuntuforums, and it's really fun! you should give it a try, and maybe we can have some deathmatches or something.. as far as i'm aware, it's not in the ubuntu repositories (fortunately for me, it
is in the aur

) but it should be easy enough to build. according to the pkgbuild the dependencies are alsa-lib, libgl, and mesa (there are probably some *-dev packages you'd also need since, in ubuntu, you don't necessarily get all the headers required to compile things when you install libraries).