If you are ever looking for useful file formats to read from, may I suggest files generated on Psion Organisers? There are files of the following types:
- Word processing - Spreadsheet - Database - Calendar
It is possible to run an official Psion emulator on Wine, which generates files in the offical formats. Many users have files on Compact Flash cards that would benefit from being made more accessible and/or converted into an Open Standard Format.
There is further information available here, including the file formats: http://frodo.looijaard.name/project/psifiles
It would be very helpful to convert from the Psion Database format to an Open Standard - the Psion format is not just used for Contacts, but is flexible general multi-field database