Gaming on Linux? That's not something we hear every day just yet, but it looks like the good folks at Valve might be considering a penguin revolution. In one of the latest beta releases of Steam for Mac, Phoronix spotted a mention of the open-source platform in the launcher script, and we were also able to verify this code ourselves. Furthermore, the eagle-eyed Linux blog has previously seen a handful of evidence hinting Linux compatibility for Valve's Source gaming engine. We're probably still a ways off from any announcement (if ever) so for now, let's just leave the guys alone -- we don't want to distract them from bringing the Portal goodness to our Macs now, do we?