The Silent Hill talk comes at the right moment as I just beat Silent Hill 4: The Room yesterday, meaning I've know finished every main Silent Hill game all the way through.
They really should come to Steam. Silent Hill 2, 3, and 4 already had PC ports, Silent Hill Downpour is Unreal Engine 3 so it wouldn't be part to port at all, and Climax Studios (makers of Shattered Memories and Origins) have PC porting experience and in fact just PC ported one of their games to Steam literally yesterday.
Ironically the game that would be hardest to port is already on Steam, Homecoming (but the port is bad).