Here are some highlights (and screenshots) for those who are too lazy to read the entire article

"Valve does have some great plans for Linux beyond just shipping the client versions of Steam and their popular games on the Source Engine."
"It has taken longer than most anyone would have anticipated, but the fact remains that Valve is in fact creating a native Linux port of their Steam game distribution client and of the Source Engine to run natively on Linux."
http://i.imgur.com/i7FD6.jpg (Screenshot)
"This Linux work just is not some half-assed attempt by them to make it look like they are a Linux-friendly organization. Gabe's vision to support, embrace, and promote Linux are amazing"
"Right now the game they have been working on the most for their Linux client is Left 4 Dead 2."
http://i.imgur.com/ts8Sy.jpg
http://i.imgur.com/OIWnw.jpg
http://i.imgur.com/5O6zF.jpg
