As per P3Droid, this method should work on the following devices, as tested:
Droid 3, Droid Bionic, Droid X, Droid X2, Droid Pro, Droid 2 Global, Cliq and Cliq 2
I got an OTA update this morning. System version is now 5.7.906.XT862. Kernel is 2.6.35-7-g5fa4155. Build 5.5..1_84_D3G-66_M2-10
This method no longer works for me to root the phone. I'm perfectly willing to except that I've done something wrong in the process but I'd like to hear if other folks have been able to re-obtain root after the OTA update.