The Steam for Linux beta program is now open to the public! In order to participate in the beta, you must download the latest Steam Linux client (found here) or upgrade your existing Steam for Linux client to the latest version.It's a Debian package, and so it's super simple. May need to upgrade my video, though. My display may not be up for something this revolutionary.
If you're not familiar with Steam or Debian packages, you just might have a life.