@evad

I'm also using goosync to sync with google calendar. I find that events with reminders on them don't get synced correctly:
-Create event on n900, reminder for 15 minutes : shows up on google calendar
- Create event on google, reminder 15 minutes: shows up on N900, but no reminder.

Is the behaviour any different on your N900 ?

(Also: just received the phone.. how can I check which version is installed ?)

Update: looks like the contents of the google calendar are copied to the phone, and override what's on the phone, i.e. a deleted item on phone is overwritten by the old item in the calendar