I'd love to jam with anyone from TheFret. It would be a blast!
That said, I'd love to jam with George Lynch and Paul Gilbert. Or, rather, I would like to watch them play and pick my jaw up from the floor.
Of course Billy Gibbons would probably be a fun, laid back jam. Joe Bonamassa would be cool to jam with, too.
Guitars:
Fender 2006 MIM Fender Stratocaster HSS in 3TS
Ibanez RG 570 with a bridge Invader
ESP M II Deluxe with a Tune-o-Matic bridge
Eleanor, the magical, mystical Road Worn wonder Tele
Blackstar HT Club 40