GDC is winding down here in San Francisco, but Playcast Media is hoping to snag its 15 minutes by announcing new partnerships with Atari, Capcom, Codemasters and THQ (to name a few) for use in its "console-free games-on-demand" service. 'Course, streaming games in through a set-top-box is nothing new, but few operators in the States offer such a thing with any real substance behind it. Playcast's solution enables titles to be pushed through existing cable and telco STBs, and we're told that the US market is next in line to get gifted. We're not given any significant details beyond that, but we're pretty jazzed about big name publishe