AllExperts: TV and Radio: Volunteer "experts" answer questions about various programs. Includes archives of past answers.
StakeHeart.com: Discussion about Angel, Stargate, Farscape, Stargate SG-1 and other science fiction and horror shows. Includes message forum and news.
W3CulTV: Cult television message board.
Yahoo! Groups: WB Talk: Discussion group for topics related to shows aired on the WB network. [Yahoo! registration required.]