The iUSB Tunnel version 1.2.0 is a homebrew application for the iPhone developed by nurkjon. It's a simple gui that should make it easier for you to use SSH, VNC and Tethering with your iPhone over USB on a Windows machine.
It's also described as a lightweight program, and is portable too - so you can run it wherever, whenever, from your USB stick. Other features include:
- Firefox Portable
You can get it through the dev's site linke below.