The Phoenix Forum is very good for Business to Business relationship building and getting things done. There are no booths or show floor, there is no entry fee but you still have to fill out the forms.
I have found the Forum to be classy and well-organized. It is not all gay, but definitely has the highest percentage of gay businesses of any of the shows I have attended.
The Forum is fun, it is well-organized, and it is attended by people that are serious about the business.

Oh, and they always ask me to speak on their legal forum. Gotta love that!