Louis CK's Louie premiered last night and the biggest surprise wasn't the jokes, it was the format. Like Seinfeld, the show begins and ends with the comic doing a stand up routine that coincides with the plot of the show.
I must admit that beyond the format of the show, the two shows aren't very similar. Louie revolves around one lonely guy with two daughters, whereas Seinfeld had a gang of recognizable friends. However, all of them share the same "down on their luck" and "man, this guy can never win" feeling that the characters of Seinfeld and Larry David's Curb Your Enthusiasm have.