There are no surprises in the User-Agent for the "final" build of Android 2.2 for the Nexus One
Mozilla/5.0 (Linux; U; Android 2.2; es-es; Nexus One Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Again, the only change is the build identifier. I tested just in case the demo for contentEditable and it has the same problems, it's almost impossible to use. Even the trackball isn't recognized as a way to move the caret (that is invisible btw).