Valve has said its Steam for Linux beta would arrive in October, and what did you know, it has delivered. Well, you can sign up for the beta in October at least, and try for a shot to get in. Valve is only looking for 1,000 testers of the Steam for Linux client and prefers them to be experienced Linux users, so if you've never run the open-source OS before, you should probably sit out this initial batch. Ubuntu 12.04 and higher is required as well, but that shouldn't be too hard to meet. Interested applicants need to take a survey while logged in with their Steam account, and then the waiting game begins to see if you're one of the first 1,000 accepted. There was no mention of just how soon the beta will begin, so you may not want to wait too long before filling out the survey.