I stumbled across the Bankruptcy Database Project which covers bankruptcy filings beginning with Jan 06. I was curious to know what kinds of industries tend to file for bankruptcies during recessions - e.g. furniture stores, restaurants, apparel. Unfortunately, the above link does not break it down by industry and the time series is too short.
Bankruptcy Research Database looks interesting but unfortunately, it is only for public companies from 1980.
It would be nice to be able to combine the two and extend the time series back to at least the 70s. (I should also have said that it would be nice if databases were public with free access. I do see a lot of for-fee databases around the web.)