Headed out of town this weekend, and I wanted to make sure I had connectivity no matter where I go. I know that theoretically my phone could be used to provide access for a PC, but I had never looked into it. This article has all I needed to know, for the most part:

It is not the ambition of this article to answer all your questions regarding the use of a Pocket PC as a modem but rather to show how to configure HTC Wizard and other devices that you need to connect to the internet[sic] over it. If you possess the same devices and follow the instructions, you should soon succeed. Considered strong similarities between all Pocket PC devices from HTC, it is likely that the same procedure would apply to in other cases, too.

[ PDAgold.com :: Article :: HTC Wizard as a modem (USB, Bluetooth) ]

I discovered this article by googling and finding this thread on "HowardForums". Later in that thread "Berniemac23" points out that on T-Mobile the APN is "wap.voicestream.com" and not Internet. I successfully connected via Bluetooth and USB cable, I'm sure both will prove useful at some point.

Next up is trying to power the laptop, and therefore the phone too, from my Jetta, thus allowing me to work anywhere I get GPRS/EDGE coverage.