Today Valve, the fabulously witty devoloper of the Half Life and Left 4 Dead franchises, released its video game distribution client, Steam, for Mac. Steam has been a huge hit on Windows as a means of game distribution without stores or shipping fees, and the software's consumer friendly file sharing policies–buy a game on one computer, and you can download and play it on any other as long as you're signed into your account–has made it a favorite of gamers.
As part of the expansion to the Steve Jobs universe, Valve is offering its cheeky 2007 game Portal as a free download until May 24th. The game won numerous game of the year awards when it was released, and is still fantastically fun three years down the line. Get it now, and, even if you don't have the means to play it currently, it will saved on your steam account until you get your iMac running.