Valve confirmed that Mac users will finally be able to use Steam, the company's digital distribution service, and Source, its proprietary game engine this April.

As we transition from entertainment as a product to entertainment as a service, customers and developers need open, high-quality Internet clients," said Gabe Newell, President of Valve. "The Mac is a great platform for entertainment services.

Valve's titles, which includes Left 4 Dead 2, Team Fortress 2, Counter-Strike, Portal, and the Half-Life series, will all be available at launch. The recently announced Portal 2 will also be Valve's first simultaneous release for both Mac and Windows. No word on when, or if, the entire Steam library will be made available to Mac users in the future.

"Our Steam partners, who are delivering over a thousand games to 25 million Steam clients, are very excited about adding support for the Mac," said Jason Holtman, Director of Business Development at Valve.

Steamworks for the Mac supports all of the Steamworks APIs, and we have added a new feature, called Steam Play, which allows customers who purchase the product for the Mac or Windows to play on the other platform free of charge. For example, Steam Play, in combination with the Steam Cloud, allows a gamer playing on their work PC to go home and pick up playing the same game at the same point on their home Mac.

This makes it very easy for us and for anyone using Source to do game development for the Mac.

Quote Source: Steampowered.com