On a semi-related note, Stu Hamm (bassist on some of Joe's albums and the G3 tours) has put togther B3, the bass version of G3.
It includes Billy Sheehan (Mr. Big, Talas, and David Lee Roth w/ Steve Vai) and Jeff Berlin (Bruford, Allan Holdsworth).
They did the East Coast and Asia earlier this year and are supposed to do the Western and Southern U.S. in 2007. Keep your eyes peeled.
I saw Billy with Talas warming up for Ymgwie many years ago. It remains one my concert highlights.
Billy in Japan with Mr. Big.