The Anarchist FAQ
The work of many anarchists around the globe. A brilliant, and VERY extensive, introduction into anarchist theory.

Consent or Coercion
An excellent introduction to anarchism. Easy to read and follow and complete with an FAQ of its own.

Everything You Ever Wanted To Know About Anarchy
A fairly extensive introduction to anarchism. Also makes an attempt to tie in anarchism with anarchist tactics.

Andrew's Course in Anarchy
A good site to get an introduction to anarchy. At points a little drawn out but overall worth reading.

An Introduction to Anarchism
Name says it all. Short but sweet.

infoshop.org
Probably the busiest anarchist website on the internet. Especially worth checking out for the news it provides.

Another Godless Anarchist
Contains a variety of links on a variety of topics. Basic design but still worthwhile to check out.

Killing King Abacus
A thought-provoking and very interesting website with plenty of essays.

World Wide Anarchy
A site full of links that cover many categories in relation to anarchy.

Anarchy Archives
An excellent website that hosts or links to a staggering number of anarchist writings.

Anarchy for Anybody
A simple but informative website with a lot of solid content. Well worth a look.

Anarchy Now!
A well presented site with information on what anarchy is, specific theory, history and more.

Blackflag Forums
One of the more active anarchist boards on the net although it can be very tangential.

Yahoo Groups: Anarchism
Probably the biggest of many anarchist groups on Yahoo.