Thanks to Ross, Dates is now installed on my N810. I played a bit with it and it looks great. So great than I'm considering to use my N810 as an organizer. But I'd really like to be able to synchronize it with the Evolution running on my desktop.
Conduit seems really promising but I didn't see a Maemo port yet. Maybe OpenSync or Sync could do the job too? So, if anyone has some experience in N810 <-> desktop 2 ways synchronization, feedback would be really appreciated.