I've been searching for the last 2 hours and can't figure this out.
I just finished developing an application with jquery mobile / phonegap, downloaded all the android sdk stuff, downloaded the google usb driver via sdk.
I've tried connecting my Incredible 2 numerous times in order to install ADB via device manager like everywhere on the internet was saying. But when I go to my device manager, there is nothing that says "Other Devices" just "Unknown Device" under usb ports...
Not sure, I've tried almost everything including modifying the google usb inf file to add support for the Incredible 2, still no luck after connecting. Not sure if I have to manually install the google driver or something? I just downloaded it with the sdk, haven't done more with it.
Be sure to go to Settings->Applications on your phone and allow "Unknown sources".