I still use mine on a daily basis. I was using it as my phone up till about a year ago, when my company gave me an iphone (which I hate, for the record). My N900 is my "brain prosthesis" as a friend of mine calls it.

I use the iphone as a phone, but I use the N900 as (among other things) my book reader, note taker, media player (I'm not about to upload all of my media to itunes, and even if I were, I run Linux on the desktop, so apple says I can't anyway...). The FM transmitter means that I can play my podcasts in the car without a bunch of extra wires.

I have both the N900 and the iphone paired with my LG Tone (HBS-700) bluetooth headset, the iphone paired using the HSP/HFP profiles, and the N900 using the A2DP/AVRCP profiles. Unfortunately, the iphone requires you to buy a $5 app to turn off bluetooth profiles, and I was not about to do that, considering I was able to do it in about 10 seconds in vim on the N900.

So my N900 is used almost as heavily now as when it was my primary phone.