Nokia didn't buy Ngage, they created it. It was a singular device, but now its a gaming platform installed on most Symbian devices. As I mentioned in another thread, Maemo is too open, and it'd leave the games open to piracy. DRM is mandatory to protect the developers, so we'll have to see if users want such a thing on an open device, but I think they will.

I'm surprised you guys no nothing about Ngage! It allows online gaming, too.