Here are just some things that quickly came to my mind why I love my n900:
- Presence notifier (what mobile phone can do it???)
- Media IM status updater
- The Onion Router
- Sound Quality, through the bluetooth of my car or even through the headphones that came with it, simply awesome.

I guess those are just things that for me make my N900 unique and difficult to be replaced so far.

have a good one you all!