And the end:
Today, I retired my old license plates, my Maine plates.
Tomorrow, I request my California license - it takes a week or two to come in the mail.
I know of nothing more on paper that ties me to Maine or Pennsylvania. All mail comes here, I have my own insurance (car/dental/vision/medical), I'm not a dependent, and my car stuff is transferred to Califrnia.
It may have taken 3 months, but I think almost everything is taken care of with moving out here.
[EDIT: I have also registered to vote, and now have a paper California license. In a bit, I'll get my real one - I probably should bring my passport to the airport until I get my new license, since they punched a hole in my old one.]