Brian, I know you keep trying to get us implement VistaDB support , and I appreciate your effort, but I don't think we'll implement VistaDB support anytime soon. We believe that the power of LLBLGen Pro isn't in supporting yet another DB (with its own share of problems, and trust me, if you have to deal with a wide variety of different databases, you definitely don't want to support all of them out there).
We also think that with SqlServer CE Desktop for example, it's no longer necessary to have vistadb support. Also firebird embedded is a good alternative. Both are free.