I think we had this from its earliest incarnation. Remember also watching G4 at a friends house.
Portal was always my favorite. I think the host was one of the few passionate guys they got. Cinemetech was good for upcoming trailers.
Icons was awesome when it was about game icons.
Judgment Day was aight. Victor is cool but Tommy is irritating. Stick to music, man.
Cheat always sucked because if it wasn't hosted by an obvious crackhead, it was hosted by a piece of meat.
Arena was just lame, not just because of Wil or anything, but because it just felt lame (honestly like most of G4s shows). If I remember right, the producers were slime on it.
X-Play of course was the best addition to the channel, at least until the set change with the crystal balls and shit. Liked their stupid skits. Too bad Adam Sessler turned out to be a fraud.
I just remember the slow downhill nightmare this channel became with non-gaming shows and obnoxious adverts like this was Spike TVs little brother.