Something I thought would never happen considering the EA Download Service is a competitor but EA have finally embraced the Steam platform, ditching 3rd party DRM in the process.

Steam Launches Hit PC Games from EA

"EA is one of the industry's largest publishers," said Gabe Newell, co-founder and president of Valve. "The EA titles coming to Steam this holiday include some this year's top PC titles."

"We are pleased to extend our holiday titles to gamers worldwide via Steam -- a revolutionary technology that is one of the game industry's most successful digital distribution services," said John Pleasants, President, Global Publishing & Chief Operating Officer.  Source

Update:  Now available in Europe and Australia.  Thanks Valve.

Available now:

• Spore
• Spore Creepy & Cute Parts Pack
• Warhammer Online: Age of Reckoning
• Mass Effect
• Need for Speed Undercover
• EA Sports' FIFA Manager 2009

Coming Soon:

• Mirror's Edge
• Red Alert 3
• Dead Space

More info at Big Download and This Steam Forum thread.