You'd have thought they'd have tried for the steam route. Then again, there's always been mutterings of disagreement regarding how much to charge and such like.
Saying that, there's a few doujin based games (shmups mainly) that are getting localised by small independants and put on steam so maybe one day. Although it's a long cry from having Fate/Stay Night or Saya no Uta up there/
Remind me, Steins;Gate is a 360-exclusive? I don't follow the visual novel scene. But still, there's probably *some* demand for a legit English version, and a PSN version of the PSP game strikes me as the most likely scenario at the moment. But then again, licencing.
Plus none of the medium-sized translation companies (XSEED, Rising Star, Aksys etc.) is involved with Steam (yet...
Steins;Gate was a PC game, it was exclusive for the 360 last year but a PSP version followed quickly after. It's already up on PSN in Japan, but there's a fan translation of the PC/PSP game coming, they're working on it.
I've owned the PSP game since last year and I'm just in the process of seeing all the endings. I've played the game for 50 hours and I have 3 endings left to see, I have save files to see two of them but I need to skip through to see the true end. Fantastic game.