Another oldie but goodie: the Internet Theatre Database has cross-referenced information about stage plays and musicals, including original and revival Broadway casts as well as writers, composers, producers and more.
This is BrainLog, a blog by Dan Sanderson. Older entries, from October 1999 through September 2010, are preserved for posterity, but are no longer maintained. See the front page and newer entries.
February 21, 2003