Stardock and Ironclad Games' Sins of a Solar Empire: Trinity, the bundled collection of the epic space armada RTS and its mini-expansions, is available now on Steam. After selling over 2 million units, mostly through Stardock's Impulse digital distribution system, the game is finally warping over to Valve's service.

"With the sale of our former PC digital download technology to GameStopearlier this year, we no longer have any conflicts of interest in offering our titles to other digital distribution channels," said Brad Wardell, CEO of Stardock. "We are starting with Sins of a Solar Empire: Trinity with other titles being made available over the coming weeks."

Sins of a Solar Empire: Rebellion, a "full-fledged expansion" of the series and not a sequel, is expected to launch next spring. Stardock plans to add more of its catalog in "the coming weeks."