Oh God, I pray they don't make DOTA2 available on Linux. The only thing stopping me from wasting my life there is that I have to reboot to Windows to play.
DOTA2 is based on their Source engine, just like TF2 which is already ported. Your productive days are numbered, I'm afraid ;)
I was afraid of that :(
Have you tried Heroes of Newerth? It works great under Linux. ;)
Oh shut up :P
I feel the same way about LoL. I've kicked the habit recently.