I used mine quite a bit in grad school, since I could surf the internet and check emails via campus wifi without lugging around a laptop. Sometimes, I packed a USB mini-keyboard in my bag and used it to type up notes and assignments using Open Office through qole's awesome Debian application.

However, since I've picked up a Blackberry Curve, I use it a lot less. The Curve (with the T-Mobile EDGE data plan) doesn't require me to be tethered to a wifi hotspot when I'm out, and the Curve will access the internet through my home wifi network when I'm in front of the TV and want to Google something random.

I still use the N800 to browse the internet while I'm in bed...the screen really is better than the Blackberry. I also use it to stream BBC World Service radio at home. Surprisingly, I use it a lot as my mp3 player...Canola blows away the Blackberry in this regard, and the Blackberry doesn't have an FM radio either.