A pretty full-throated endorsement of laugh tracks for single-camera comedies. Not sure if I fully agree, but interseting.
Probably more negative than positive in this one, but it contains an good defense of the laugh track's use in certain situations.
The best of these, though it's more about studio audience laughter than laugh tracks per se. That's probably good, since very few people (other than #3 above) I know of actually think that canned laughter in single-camera sitcoms should come back. So the point about taped-live shows is more interesting to argue. Also, might I add that this blog, written by a former writer for Taxi among other shows (but it's Taxi that I care about because I LOVE TAXI) is absolutely delightful in general. I'm going to subscribe to it in Google Reader right NOW.