I don't want to revive a dead thread -- but I was trying to connect my N810 to my laptop via PAN like some people were talking about here, and was able to do it after some poking around.

Thanks to the Maemo-PAN project, it is pretty easy if you can convince your PDA that your laptop is a phone. To do that on a Linux machine, I did...

Smartphone:
sudo hciconfig hci0 class 0x5a020c

And if you want to go back, a laptop is:
sudo hciconfig hci0 class 0x5a010c

Then I just paired it up as if it were a phone and it zipped right on. I also use Ubuntu and the Blueman packages, though, and turned on PAN and GN support.

Hope this'll help someone else looking into doing something similar later.