If you release it for free, they will download it. Valve has revealed that its free download of Portal, offered as part of the launch for Steam on Mac, has been anxiously grabbed by 1.5 million users. If you have yet to acquire your own free copy of Portal, get on it. You've only got until May 24.
Valve also released some interesting figures on Mac user habits on Steam. According to their findings, two-thirds of Steam for Mac users are running the service through a laptop. Also, more than 11% of purchases made on Steam have been by Mac owners. No word on whether one of those upcoming Mac title sets will feature the Valve catalog, with games such as Left 4 Dead, Counter-Strike and Half-Life. When making their announcement in March, Valve had said their titles would be available in April along with Steam for Mac.