Use Powersearch to find Application Notes, Design Tips and Technical Articles
Check out the extensive book reviews page contributed by Jerrold Foutz of SMPS Technology Knowledge Base
Interactive Power Electronics text book contributed by Venkat Ramaswamy (includes Java simulations)
Discussion Forums - topics under discussion are:
Electric Vehicles and Battery Charging Motor Drives and AC Inverters Power Converters (Power Supplies, UPS, ...)