It took me a bit of time to locate how to enable Internet Sharing on my new AT&T Q9. Internet Sharing is standard in all Windows Mobile 6.0+ devices. Here’s where I found the answer
In brief: Copy IntShrUI.lnk from the Q9’s /Windows directory to the /Windows/Start Menu directory. To see IntShrUI.lnk, you will have to change your file explorer’s options to see both Hidden and System files. Unhide the copied IntShrUI.lnk by removing the Hidden attribute. Tether the Q9 to your computer with the USB wire, and enjoy 3G browsing speeds on your computer.