In answer to some of the questions above
1. You do NOT need a PTAL to apply to Cali programs. You would need it if you matched to one.
2. PD letters were required for all but one program I applied to. Don't need a chair's letter unless specifically asked for. My advice as to the best combo - PD letter + 1 letter that attests to your awesomeness as an IM guy/gal + 2 strong PCCM letters. I applied with 2 IM and 1 PCCM letters; no one batted an eyelid or said anything. Make sure you get your letters from people who really KNOW you an can talk about you.
I heard the same from some of the fellows in CA saying that they did not have PTAL prior to getting the interviews and they applied later.. What I am not sure about is that ERAS asks about this , if you are gonna need the PTAL : IMGs must apply.. so should we ignore this question or answer yes and then apply later.. confused in this regard ..