Alex sez, "An interview with Douglas Adams originally broadcast in 1988 has now been made available online. It was recorded while he was promoting The Long, Dark Tea-Time of the Soul."
(Thanks, Alex!)
Update: Elmotion points out this 90 min RealAudio of a talk that Adams gave at UC Santa Barbara a month before his death. Too bad (shocking, really), that the university chooses to use a proprietary, DRM format for distributing its stuff, rather than an open format.