dFirst, Support Coalition International has an excellent web site including probably the best collection of madness and anti-psychiatry links.
NARPA (National Association for Rights Protection and Advocacy) is good for lawyers and to get information from a legal angle.
World Network of Users & Survivors of Psychiatry is a worldwide organization especially doing advocacy to UN & other international bodies, has email list.
If you want information about the Disability Rights movement, a strong ally of ours, check out Mouth Magazine and Disabled In Action.