Jared Spool in conversation on the topic of personas - composite characters based on real users, created to help the website development process.
He has some useful hints and tips both for those starting out, and for those looking to improve how they work with personas.
Robust personas questions & answers - podcast to download or listen online, featuring Jared Spool in conversation.
This session was recorded in 2007 and it's worth noting that Jared seems to have subsequently softened his view a little on the level of research needed to inform persona development. I previously blogged a conversation of his with persona expert and author Steve Mulder.
Jared Spool on personas