Android 2.2 to integrate USB tethering, mobile hot spots With less than a week to go before Android 2.2 is unveiled, the list of new features continues to grow.

Certificate invalid? What exact version of Android are you using, and what program are you using to USB tether-- is it built-in to Android or is it an app like PDANet+?

I don't know about USB tethering, but I have the option to do wifi sharing of my Xoom's 3G network connection.