Android Proxy App
http://graha.ms/androidproxy/

useful

"This is an experimental SOCKS proxy and Port Bouncer that should allow you to connect your laptop to the internet using the internet connection (EDGE, 3G or Wifi) of your T-Mobile G1 Cellphone. " Not a true "tethering" app, claims the author (Graham Stewart), because it doesn't have access to low-level packet APIs for a NAT connection.

an experimental SOCKS proxy and Port Bouncer that should allow you to connect your laptop to the internet using the internet connection (EDGE, 3G or Wifi) of your T-Mobile G1 Cellphone.

Android application for limited tethering to the phone's internet connection. The app can act as a SOCKS proxy or forward an individual port.