The Pandemonium games were developed by Toys for Bob, which is owned by Activision now, however the publishers, Crystal Dynamics were bought by Eidos, who then in turn were bought by Square Enix, I am not sure which of the companies that currently has the rights, but I sure hope it's Activision.
Also, Sierra developed the only official expansion to Diablo 1 (which someone pointed out earlier in this thread) and then promptly forgot about it, it seems. They didn't even try to re-release it when Diablo 2 (or it's expansion) hit the streets, which I personally found strange. Now, as you all know, Sierra is owned by Activision, so there be hope yet. Especially since Acitvision has merged with Blizzard... Makes you wonder if you'll ever see a Complete Diablo collection (1+exp+2+exp+3)...
Also, I'm pretty sure all the LucasArts adventure games are still with LucasArts... That means The Dig, Full Throttle, Monkey Island, Grim Fandango and so on... Let's hope gog.com reaps in a whole lot of cash from this deal with Activision, forcing LucasArts to make a deal with them to. Oh, and Atari for the Infinity Engine games, Atari also owns Infogrames, which had a lot of nice games... And EA For American McGee's Alice... And I think they might have System Shock as well?
Post edited February 04, 2010 by Duffadash