next priorities:

- documenation (man pages)
- better show output
- more resilience in the programs (which do bugger-all error checking
  at the moment)
- Emacs integration, perhaps simply a matter of adding Accept and
  Decline keystrokes to a show mode
- support for Apple iCal
- support for proposing, updating, and receiving replies to a meeting
  proposal

and then longer term, support for other bits of the iCalendar standards
(alarms, todos, etc)