"It's officially official: Valve will bring its Steam online distribution service and titles from its massive library of hit games to the Mac this April, the company confirmed Monday. The successful content-delivery service will bring Valve titles like Left 4 Dead and the upcoming Portal 2, as well as games from other publishers, to Apple computers for the first time. The move was telegraphed last week in a series of teaser posters that mashed characters from Valve games into retro Apple ads." The big thing: native! Native! No emulation! Great news for Mac fans, and hopefully, a Linux version is on the way too.