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http://store.steampowered.com/freeportal/

There's an excellent offer going on at SteamPowered.com right now. Until May 24th, you can grab the award winning game Portal for free, and it's available for PCs and Macs. You'll need to have Steam installed, but that's hardly anything to complain about.

Portal was widely acclaimed when it was released in late 2007. It won heaps of awards and has a score of 90/100 on Metacritic.com. For anyone who hasn't played it or doesn't already own it, this is a great freebie!

Already bought it when it came out (or shortly thereafter), but I can't wait for the second one.