There have also been two spinoffs from the same people that did MST3.

Rifftrax:http://www.rifftrax.com/content

Cinematic Titanic:http://www.cinematictitanic.com/

Both of these are worth checking into. I have seen a couple of dvds from Cinematic Titanic and they were pretty funny. Also a couple from Rifftrax and those are good too, especially the shorts (riffing those old public service ads and lame school instructional videos, like why you shouldn't cheat, etc.)