USB tethering generally needs drivers
According to the help, Verizon USB 3G modems work with the Edge. Most verizon phones can operate in a USB modem mode for tethering, hence the question.
all newer phones or phones that have updated to 2.2 have the ability to become a WiFi hotspot - which does work with the edge
This is the ad-hoc tethering referred to in the original post- which has been thoroughly documented on these forums and elsewhere not to work with the Edge. Am I missing something?