The List of Netflix distribution centers has been deleted from Wikipedia.
UPDATE: I have copied the list here. If you would like to contribute the missing addresses (from your return envelopes), please put them in the comments.
UPDATE 1-6-06: As Heather Anne pointed out in the comments, this list originated on Listology, and is being maintained there by Jim, a very nice guy. However, this list includes the mailing addresses for each location.