I’ve heard that the actors on Friends got $400k per episode. I guess it depends on the show.
http://wiki.answers.com/Q/How_much_money_did_the_cast_of_friends_make_per_episode
They started out making about $22 grand an episode, but they topped out towards the end at a million dollars an episode.
Actually the six stars of Friends got $1,000,000 per episode the last season OR two. $25,000,000. Before that that there was a season of $750,000(I believe).