I personally gave Steam a test run last night and found that it works quite well. A few things to note for those who want to give it a try:
- Runs best in Ubuntu (You'll need to be running one of the following versions: 10.04, 11.04, 12.04 or 12.10)
- You may need to update your video drivers to run Steam. I found myself forced to run unstable Nvidia Beta drivers in order to get Steam running.