I'm just back from giving a talk at Embiggen Books on the Sunshine Coast. Embiggen Books is a wonderful enterprise and deserves your support if you get a chance. It has a thriving mail order business, and is a possible alternative source of books on science, philosophy, etc., in addition to Amazon and Fishpond. It has a huge range of titles, including, of course, 50 Voices of Disbelief.
The talk was taped and will appear on the site at some stage - I'll doubtless let you know when it's up there, but probably quite soon!