Ditto on your list in the first posting here, Mouth....then, last night I put on the DVD for the 1990 remake of Night of the Living Dead, and thought that I could add something valuable to the thread (which I admit I didn't read all the way through until just now) and made it a point to come back and say what a good commentary Savini provided for that movie.
Then I saw that you already mentioned him a few posts later.
(I'd have to say that my favorites by far are John Carpenter's and Peter Jackson's commentaries, by themselves or with cast/crew.; hugely entertaining and informative to listen to, you can tell that they love what they are doing, regardless of the end results. )