A new era in gaming begins today, with Valve’s rollout of Steam for Mac. To get you started, the universe’s most referenced game ever, Portal, is FREE until May 24! That goes for PC users too, so go get you some! But don’t stop there. There are plenty of games you’ll almost certainly want to definitely check out on the new service. Really. And with weekly updates, you’ll have plenty to distract you from the brilliant artsy crap you do on your Mac.