@Caracal:
Adult Swim is actually part of Cartoon Network.
Strictly speaking, Adult Swim isn't part of Cartoon Network as the powers-that-be officially split the two for ratings purposes. Unless they changed it back for some reason, Adult Swim is technically a seperate network that airs on the same channel for eight hours while Cartoon Network inhabits it for the rest of the time. Nickelodeon and Nick-At-Night do the same thing or, at least, they used to. It might not work that way anymore.
Not sure on G4 though as I don't live in the US.
G4 doesn't show anime currently, but they never officially cancelled Anime Unleashed either to my knowledge. So it might come back one of these days.
Fuse has an anime block now too from what I understand, but I don't know what's on it. I could check, but that would require that I give a damn about Fuse or actually watch it and I refuse to do either.