A year after making its public debut at GDC 2009, OnLive announced at this year’s Game Developers Conference that the Mac and PC versions of its cloud gaming service will be available to the general public throughout the 48 contiguous United States on June 17, during E3 2010 in Los Angeles. Pricing will be US$14.95 per month, with plans to announce multi-month pricing and other offers by the start of E3. Purchase and rental of games will require separate fees to be determined by publishers.

On Mac and PC, OnLive operates as a small browser plug-in that provides access to the service and lets gamers play games via streaming video feeds, allowing them to run on systems that previously would have struggled with heavy system requirements. All of the games’ computations are performed in an OnLive data center and streamed to the user.

OnLive also offers the ability to capture and post brag clips of important gaming moments, massive spectacting of games, the ability to pause a game and pick it up later, even on a different platform, and more. OnLive has been shown running on an iPhone, but plans to bring the service to portable devices have not been revealed. OnLive will also work on TV sets via a MicroConsole box, but availability of that device will be announced at a later date.

In addition, OnLive will waive the monthly fee for the first three months to the first 25,000 qualified registrants. A formal announcement of launch titles is planned for E3, but the company said that a few of the anticipated games are Mass Effect 2, Dragon Age Origins, Assassin’s Creed II, Prince of Persia: The Forgotten Sands, Borderlands, and Metro 2033. Dragon Age Origins is currently available on the Mac from TransGaming and the last Prince of Persia game was also published on that platform by them, but Forgotten Sands is a new title slated for release in May.