bansama: I expect it's like most of their games and you'll need Impulse only for when you patch it. But I don't use Impulse so I can only go by what's written on their site.
Crassmaster: Actually, they just released a new version of Impulse...one of the features of it is that it would have Impulse's DRM/patch access built in WITHOUT requiring the Impulse client. I don't know if it was 'ready to go' early enough to be used for Demigod, though.
You're referring to 'Goo'. Ive read a lot about this game and as far as I know it has absolutely no DRM, Goo included (unless you count the Impulse/patch thing as DRM). Even if it has Goo, I might buy it..basically it's just a one time activation, tied to your email/serial. Sucks for people without Internet, though...
Edit:
Wardell (Stardock CEO/game's executive producer) says it has zero copy protection. Im gonna assume that means zero DRM (patches excepted), also. He says some interesting things about piracy there, for those interested..
Anyway yeah, Im definitely picking this up.