I got two e-mails today inviting me to join the Yahoo Group "Insightforum". Never trusting such things in e-mail, I went straight to Yahoo Groups and tried to find it -- no such animal as far as Yahoo search knows.
1. Midpeninsula Insight Discussion Forum: http://groups.yahoo.com/group/insightforum
— I don't know anything about this one.
2. Insight Forum: http://groups.yahoo.com/group/insight_forum
— Inactive since 2007
3. Insight Practice Forum: http://groups.yahoo.com/group/InsightPractice
— Very active group moderated by Jinavamsa/Mitchell Ginsburg, an American student of the Thai teacher Dhiravamsa. Its threads are pretty wide-ranging, but the focus is chiefly North American vipassanā, and especially the more eclectic and psychotherapy-oriented wing of this movement. I've been a member almost since it started, but haven't read it for ages as it's not really my cup of tea.