The best source for juggling information is the Interactive Juggling Database.
The previous best source is the Juggling Information Service.
The very american International Jugglers Association.
A good source of unusual props can be found here.
Diabolo: Great site here and forum here.
Devilsticks: Sites here, here, and here.
Hat and Plate manipulation: The only site worth mentioning is here.
Coin manipulation: The site is here.
Jesters and jesting:
Probably the best site is here.
The Foolery Page is here.
Part of the book by Beatrice Otto can be found here.
Face Painting by Cathy Malcolm
Photography by Lee Marshall
Disco by Party-On
Fun Casino by Funtastic Casino
Local performance related clubs:
Wellingborough Magical Society