The Valve Linux Blog announces they will begin internally testing Steam for Linux next week, and will begin admitting external testers next month, saying: "Things have been going well. We will be having an internal beta starting next week, and a private external beta for 1,000 users sometime in October." Here's word on where they are with this:

The private external beta will include:

• Steam
• One Valve game
• Support for Ubuntu 12.04 and above

It will not yet include:

• Big Picture mode
• Additional Valve games