RevdKathy hits the point. Calendar is missing crucial features:

• adjustable start/end time for day view (show only working hours, for example), how needs entries at 3 in the morning..?
• no search, makes calendar quite useless to locate certain events
• smart birthday doesn not show age, why?. Doesn't sync with Outlook or other PIM?

Even more important is email search. It is practically impossible to locate an email if one cannot remember exact date and/or sender.

Email notification for new emails should be in account level also. It's frustrating to open each account to see if the new emails are there..

More configurable settings in applications. Good example is photo viewer, I'd like to select the default folder it shows and also N900 should remember it. I also don't want to see mp3 covers in photo view either..

Maps got better with PR 1.1, but are still far from being even close to Maps in other N-series phones:
- no user POI's (would help route settings etc.)
- search requires connection, why?
- UI still clumsy (who invented the "default" Paris/New York etc. search results in search view. Should show 4 last user searches instead)

Browser
- cannot reorder bookmarks
- text reflow setting (ctrl-Shift-I) does not survive beyond browser session

I also vote for portait SMS with virtual keyboard.