For theater addicts, I highly recommend watching Theater Talk, http://theatertalk.org/?cat=5
Great interviews of current theater people, and periodic shows of four gay critics dishing the current Broadway productions. Also viewable on air in the NYC area on some public station.

For those interested in London theatre, the West End Whingers (two theater queens) provide a periodic blog with out-of-the ordinary, often humorous revues, of London theatre. They sometimes journey to New York, and provide their reviews of theater there when they go.
http://westendwhingers.wordpress.com/