That will teach me to rely on the "official" site. The Discovery site of course makes no mention of the three specials in their episode guide

http://dsc.discovery.com/fansites/mythbusters/episode/episode.html

I guess Discovery in the US are just as hopeless the the European arm when it comes to actually telling people about their shows.

I am fed up with them airing 12 part series, where they never put any episode specific info in the EPG data they send to Sky. Another Tivo benefit maybe ?
_________________________
Remind me to change my signature to something more interesting someday