Check out the "ROADMAP to this forum" thread in Qtalk. It is a great thread that has links to great how-to's, and one of them is "WHAT'S THE BEST WAY TO DO PORK BUTTS?"
Here is the link to go directly to the pork butt thread. But you definitly want to read the roadmap thread.
In order of usage:
WSM - no mods.
NB Bandera - modded.
Unknown Offset Horizontal- Looking for my babies daddy!