I actually set this up a few weeks ago and was meaning to blog about it, but it slipped my mind.
Using the info in this article, I was able to set up Bluetooth DUN on my PowerBook so that I can surf the Web using my Treo’s wireless Internet connection. The speed is actually not all that bad. What’s much worse is that the connection gets dropped a lot, so if I use it for a long time I need to keep reconnecting, which is a pain. The nice thing about it is that I can have Internet access in a pinch even when there’s no WiFi around, like at my in-laws’ place.
http://captnswing.net/howto/treodun/
Here’s the settings that work for me with Cingular Wireless:
(The password is “cingular1”).
I show them because what goes in the “Telephone Number” and “Account Name” fields is not so obvious.