BMWRA - BMW Riders Association
webBikeWorld.com - great links and useful info.
Horizons Unlimited - world travel site
PowerWerx (distributes Anderson connectors)
Posi-Lock connectors (reusable, no-solder)
Electronic circuits (including 12V-to-9V converter)
Bill Bowden's Hobby Circuits (more good stuff)
Powerlet Products Electrical connectors
Tower Paint - custom aerosol cans, etc.
Bike workstand from 2 sheets of plywood
Beemer Boneyard - used Oilhead and K parts