I'm now in this boat too. I'm not a heavy contacts/calendar user (I really need to start being a heavy calendar user, lol) so constant syncing probably isn't a big deal for me. Hopefully I can at least just import a vCard with multiple contacts so I can just bring all my contacts at once, and "sync" back to my address book the same way. Hope the N900 is smart with duplicate contacts.

I wonder if there is a chance of being able to sync contacts/calendar via mobileme?