Being an enthusiast myself of everything relating to bikes (mainly Italian), I have gathered some links of interest:
Motogira D'Italia
National Autocycle & Cyclemotor Club
Milano Taranto
Sammy Miller MotorCycles
Moto Guzzi Club Belgium
Moto Guzzi Club Of Great Britain
Guzzi Club - Somerset
Guzzi-West Guzzisti
I Gotta Gilera Owners Club
GuzziClassic Belgium

Other Links

Garage Blondeel - Probably the largest reseller of Triumph moterbikes in Belgium
Groenedijk Loft Hotel  - Excellent accommodation exclusively for motorcyclists since 1996
Tournsol - Country House for bikers in the Ardèche region
Hotel George V - Recommended Hotel in Ostend