Nice, Berel. Kudos on creating a PROPERLY TITLED thread with relevant info on the subject!
Maybe folks who posted in that vague "how to do stuff with your phone" thread should repost relevant info here to keep the board clean and efficient.
Also, I'm with dan on USBModem over PDAnet - PDAnet has been around longer so its more well known, but I'd def. give USBModem a try, I think its a more solid application.
Then again, I don't use any of these anymore... my current phone supports WiFi and I have an app that channels the data connection out to an ad-hoc network, effectively making my phone a portable WiFi router. I can then tether any number of devices to my hearts content just like I could with a real access point. Its really useful for devices that you can't normally tether to (PSPs, WiFi skype handsets, random laptops, etc).