Why not use proprietary formats and what are the main open alternatives.
  http://www.podval.org/~sds/data.html  [Site Details]

Contains information about many data formats.
  http://www.webopedia.com/Data/Data_Formats/  [Site Details]

A repository for the collection of game data formats for old Sinclair games.
  http://www.icemark.com/dataformats/index.html  [Site Details]

Detailed file formats and data formats for programmers. A large collection of programming resources with detailed information.
  http://www.wotsit.org  [Site Details]