If you get a chance go drinking with him, met him at a conference at my university and he was great fun, in my experience most major philosophical discussion actually seems to happen in the bar not the lecture theatre. (That conference also resulted in Karoake about P-zombies if I recall correctly.)
I'm doing an undergraduate course on the Free Will Theorem, with three lecturers: a mathematician, a physicist, and David Chalmers as the philosopher. The course is a bit pointless, but the company is brilliant. Chalmers is a pretty smart guy. He studied computer science and math as an undergraduate, before "discovering that he could get paid for doing the kind of thinking he was doing for free already". He's friendly; I've been chatting with him after the classes.
So if anyone has any questions for him, if they seem interesting enough I could approach him with them.
Emails to him also work, of course, but discussion in person lets more understanding happen faster. For example, in a short discussion with him I understood his position on consciousness way better than I would have just from reading his papers on the topic.