You’re just sitting down to see the latest Broadway show (or flop) and you think: I have a feeling that I have been in this theater before, but what for? Or how many times have I seen this show on Broadway? Or the woman playing the mother looks very familiar – what other Broadway shows has she been in?
These and lots of other questions can be answered at www.ibdb.com the Internet Broadway Database. This very comprehensive user-friendly site will keep you entertained for hours (all night if you do not watch it) with details of every Broadway show at every Broadway theater including complete cast lists (and their replacements).
There is a similar Off-Broadway Database (www.iobdb.com) but it is still very much a work in progress.