We showed you how to do this before and yes it is much nicer with 3G speeds. Tether your your laptop (and others if you wish) through the iPhone's 3G connection. Nate Tru has the details on his blog.
Basic steps as follows - Jailbreak your iPhone 3G - Install 3Proxy and Terminal - Create an ad-hoc Wi-fi network using your laptop - Join the network with your iPhone - Find the iPhone's IP address
- Open Terminal and run the proxy program - Open Safari on your iPhone and open a web page - Configure your browser to use the proxy
