What are the biggest sci-fi forums?

I’m having a hard time finding any. Of course, I’m interested by the most populated ones. Any help would be appreciated.

Sff.net – maybe not the biggest, but if you want to talk to SF authors, it’s the best.

www.baen.com

SciFi.com has a huge board at: http://bboard.scifi.com/bboard/frontpage.html

The SF Site is host to fan pages and the official pages of several magazines, which have their own boards.
http://www.sfsite.com/home.htm

Not quite as good as it was- it’s been taken over somewhat by the younger fantasy fraternity.
http://www.sffworld.com/

V

SDMB, the only place that never disappoints me.

Thank you all!