at least we have here one other guy/gal with the same problem. I have all my KDEPIM stuff on my laptop. If using the N900 makes sense it must allow me to enter appointments in the calendar and have those synced at a later stage with the content on the laptop.
Now it seems that you go through the cloud (and paying??right?) instead of using the usb cable or wireless or blutooth. There ought to be a better way of doing this.

Is there someone out there who has solved this simple setup N900<-->KDEPIM?

Perhaps we could get something going together?