Can I do Android/g1 tethering without root? Can I do Android/g1 tethering without root?
Yes according to this post:

This one is for the majority of Android owners who don’t want to be bothered with root on the G1 (Android). Mucho gracias to Tremendo Slap for digging this one up. June Fabric has released an app for Windows that also installs another app on Android that allows you to tether to 3G. Most users say it works flawlessly even with VPN connections. A few dropped connections being dropped here and there but overall a success. This is an app that I know many of you have been waiting for.

For those wondering, tethering is connecting your device to your laptop and using your devices internet connection on your laptop, basically.

So download PdaNet beta 1.12 (or Vista 64)

PdaNet

Note This is probably in violation of your carrier’s TOS. For T-Mobile the 1GB per month data cap was lifted awhile ago but there is word that users that pass the 1GB limit will be limited to 50Kbps for data past that mark. I would advise using this only if you are in dire need. I would advise against canceling your home internet plan as well