Make sure you can connect to the Internet using your phone alone first.
Switch BT on on your phone and ipaq then pair your devices, (which I won't go into here as it's simple).
Then 'add a new modem connection' on the ipaq by clicking on the Connections icon in Settings (not the bluetooth bumpf).
Name it whatever you want and choose Bluetooth Dialup Modem as the modem.
For the Number enter *99***1#
On the next screen enter:
User name:
WAP@CINGULARGPRS.COM
Password: CINGULAR1
Then click finish and that's it.
Then go out and buy a kensington USB BT dongle for your laptop and that'll work nicely through your phone too.
Here's a link which leads to everything you need to know but you have to hunt around for it:
http://answers.google.com/answers/th...=320698#answer
I have the mediaworks $20 thing.