On a Mac, download and run the installer, then reboot your computer when prompted. After rebooting, you should see the PdaNet icon in your Mac’s menu bar. The next step, in either case, is to launch the Android Market app on your phone and download PdaNet Free Edition.
Next, on your phone, go to Menu -> Settings -> Applications, then Development and check “USB Debugging“. This allows the operation of certain parts of the Android OS while your phone is plugged in to your computer. Once you have enabled USB Debugging, you can launch PdaNet on your device.
In PdaNet, all you need to do is touch “Enable USB Tether”. Now, you’re ready to plug your phone in to your computer. When you plug your phone in to your Mac, you will see the menu icon change to active, rather than having a red “x” in the lower right corner. Click the icon, then click “Connect,” and you’re online! On the PC, the process is nearly identical. Enable USB Tether in PdaNet on your phone, plug the phone in to the USB port on your computer, and click “Connect,” which is in the right-click contextual menu of the PdaNet icon in your Windows System Tray.
Once you’ve clicked “Connect,” you’re connected to the internet! You may want to wait a few seconds before opening your browser, just to make sure everything is all set, but once you do that, you should be able to start your browser and have everything working perfectly! Open your favorite browser and start surfing, bring up iChat or Aim and chat, or shoot off a few emails, all while on the go, with no wifi! Remember to get back to us in the comments with your experiences with the app, as well as with any others you find useful for tethering or similar purposes!