It is my understanding that most programs will only accept transcripts and dean's letters after their posted deadlines. This means you probably need to contact your letter writers and give them a friendly reminder of early deadlines. I think (??) that some of the programs will still accept the additional LOR forms, but I could be wrong about that.
Good Luck

Some programs also want to see a transcript before their deadline. The only specific one I can think of right now is Wake Forest, but I know I saw a few others when I was researching programs. At my school the official transcript goes out with the Dean's Letter on Nov 1. (I don't know if this is a school policy or an ERAS policy.) So, I just had the office attach an unofficial transcript to one of my LORs.

As for letter writers, all I can say is keep reminding them. It can be very difficult to do, but attendings are very busy people and are probably writing several letters. I just got my last letter in, and it was from a rotation I did in April.

A tip for those asking for letters right about now...just explain to the attending kindly when you ask that apps are due soon. I did this with an attending during an AI and had a letter a week later (because they have to fill out an eval on you anyway so it's easy enough to dictate a LOR)

yeah, other problem is the chair's letter. most won't write it till late october. guess the early deadline poeple will have to take what the get..or not. )