Eric Voss, annoyed that SMDS has better ratings than 30-Rock, has counted and catalogued the numbers and types of jokes in episodes of each. The results: 30-Rock has more complex story lines, more types of jokes, and relies on insults for far fewer laughs. On the other hand, one 21-minute episode of SMDS used a laugh track for a total of 4 minutes. Analysis here.
TV Scientist compares 30-Rock to Shit My Dad Says