I think interacting with folks over skype/chat might build a deeper relationship--gasp! even friendship--than a message board.

There is spontaneity to chat that the highly transactional Q&A format doesn't allow.

I love this idea... we're actually been thinking about taking some of the experts at Mahalo (i.e. our guitar teacher), and doing streaming lessons/chat/office hours.

Immediate response to your inquiries?

That too. But also able to discuss your issue or what you're trying to learn rather then just here's how to fix x y z... :-)

Maybe that you can Skype and talk directly with one person who maybe an expert in a given field.