The Steam for Mac client has been in the hands of gamers for a
week now and Valve is collecting some useful data about Mac users.
Among the statistics the company has gathered so far: two-thirds
of Steam for Mac users run on laptops, and after one week, 11
percent of all Steam purchases are for Mac. One surprising result,
however, is that the same version of Portal is five times more
stable on Mac OS X than on Windows.