Bloodygoodgames: Yep, GG is technically owned by Paradox, so you're always going to see Paradox games on there but unlikely you'll see them on GOG, IMO.
SLP2000: Really?
When GOG announced they become GOG.com not Good Old Games, Paradox’ Fred Wester twittered that he’s looking forward to selling their games on GOG.
http://www.rockpapershotgun.com/2011/11/17/good-new-games-gog-is-changing/
I just don't think it will happen. They already have their main outlet (GamersGate) where they sell their games along with a few other places like Amazon, Green Man Gaming and Steam. And, as most of their games are sold at low prices once they're a couple of years old, I don't think it benefits them to sell them on GOG at low prices too. After all, then they're paying GOG a cut of the profit as well.
Of course, it could happen and I'd love it if I was wrong. Although, I doubt I'd buy Paradox games on GOG as I already buy everything at GamersGate. Would be nice for others who wanted too, though.