Valve's been openly talking about developing on Linux for a while now, but a new blog post on the company's site today has for the first time given us our first official information on the company's plan to bring Steam to the platfom.
This Arcade-y Basketball Game Brings The NBA Jam Vibes
They say they'll be bringing Steam to Ubuntu, and while Left 4 Dead 2 will be the first game running, "additional Valve titles" will be ported later.
Linux users can read a little more about Valve's plans at the blog post below.
Steam'd Penguins [Valve]