Integrated spellcheck should be a priority. I am somewhat disappointed that I cannot spellcheck from email, MaStory or note-taking applications.

The profiles should link to the calendar (in such a way that the 'phone goes silent during certain appointments).

Desktop notification for unread emails in the status area (next to the other indicators).

Dedicated office applications (Open Office, KOffice, AbiWord. etc.) with the ability to edit and spellcheck.

Video support for Skype.

Integration of microblogging (Twitter, Identi.ca, etc.) into communications.

These are the major things I am looking for. Very happy with the N900 on the whole. Just confused as to why a device with a keyboard lacks spell check....