Bike Tweakers - http://www.biketweakers.com/
A site for motorcycle owners, riders, racers and tweakers.
BikeWeek.com - http://bikeweek.com/
See information on all the major bike week events, motorcycle rallies, charity runs, and other bike rally events in the USA.
Mr Turbo - http://www.mrturbo.com/
The home of the world's fastest motorcycles.