The only midwives I've found in this area that accepting new patients are the Back Cove Midwives in Portland. They have a great website with lots of info - http://backcovemidwives.com/. I have my first appt with them on the 23rd and I've heard great reviews, but that would be my suggestion.
Also, we toured Mercy Hospital's maternity ward recently and when I mentioned the Back Cove MW's the nurse said that they LOVED them, which can only mean good things. Hope this helps!!