An on-line juggling textbook.
Many instructive images can teach a learner the basics of juggling with balls, rings and clubs. The site also includes an FAQ.
A recent addition is the possibility to download an illustrated juggling textbook as .mobi and .epub which can be displayed on most e-book readers. PDF is also available (see here).
You can register on the server, use a map to locate other jugglers in your vicinity and promote your events in a juggling calendar.