A podcast interview with GGK, by Moses Siregar of Adventures in SciFi Publishing. Just some of the topics discussed include writing to a theme, Tolkien, reader and reviewer responses, and the use of the present tense in the novels (note: the interview itself begins at minute 6).
http://www.adventuresinscifipublishing.com/2010/12/aisfp-106-guy-gavriel-kay/