Is there any way to root an OTA'd Incredible?
Possibly, but I haven't heard anything for those who have updated to 2.2. Though I also haven't checked around. Maybe look around in the DInc section at forums.xda-developers.com? Also don't feel like you need to do this. Only do it if you are comfortable with the fact that things can go wrong. Read up a LOT and make sure you have everything correct and ready before proceeding. The DInc isn't like the Droid 1 in which it requires a little more to get the phone rooted. Though unrEVOked helps with that, you still have to make sure on EVERYTHING before continuing.