Very detailed walkthrough of how to repair the windwo regulator in a BMW. Used this approach to fix the passenger side window on the 325i.
Garage that does work on BMWs in Berlin. They got me a replacement second hand tyre, fitted, for €30.
After market, model specific cruise control for motorcycles. :-)
Touratech sell a wide range of accessories for BMW and other motorcycles. They focus on long range touring accessories.