National Semiconductor is having an online seminar called "Designing DC-DC Power Supplies Using High Performance Switching Controllers" at 9:00AM PST Dec 6th.
Go here to check it out!
Figured that many people here find this quite interesting.
You should be able to get an audio-only version afterwords, I don't know about video though (the last broadcast is in audio only as of right now).
IN DEVELOPMENT -- '96 Mustang, lilliput with PII/450 laptop, custom DC-DC power supply, 60GB; Garmin GPS; 802.11g; compact keyboard, small graphical LCDs, OBDII.