Oh my god... where do I start. Well, besides FNM and Mr. Bungle. His main projects are Fantomas and Tomahawk, which he goes between frequently.
Fantomas features Buzz from The Melvins on guitar, Trevor Dunn from Mr. Bungle on bass and Dave Lombardo from Slayer on drums. They are very experimental band which shifts genres quite frequently. A lot of time their music is very ambient actually. Its weird. But what would you expect.
Tomahawk features Duane Dennison from Jesus Lizard and U.S.S.A on guitar and John Stanier, ex-helmet/current Battles drummer. Their first two albums were very straight forward rock oriented, as far as Patton is concerned. However, their third album Anonymous was a huge departure. They transcripted 200 year old native american sheet music and added their own flare. Its a pretty unique and incredible CD.
Of course there is Peeping Tom, which is kind of Mike Pattons baby. It took over 6 years to finish recording that album. And now we have Crudo, which as I said, no one knows what it will sound like. Patton also did and EP and short tour singing for The Dillenger Escape Plan as well as produced Bjork's album Medula.
Patton is currently working on an album with another new group Mondo Cane and they do Italian Pop covers from the 50s and 60s. Yes, you read that right. As well as the Crudo album and another Fantomas album.
He is seriously the bussiest guy in the world. I don't know how he does it. There are a ton of other projects he has done, but i just went over the basics. If you want to know more, go to
wikipedia.