http://en.wikipedia.org/wiki/Full_disclosure_(mailing_list)

  Full disclosure is a lightly moderated security mailing 
  list generally used for discussion about information
  security and disclosure of vulnerabilities. The list 
  was created on 9 July 2002 by Len Rose and is 
  administered by John Cartwright.

The wikipage goes on to list some notable zero-day vulnerabilities.