Apply as early as you can to get the best DAT score you can. I submitted my application in the first week of October. it was complete at that point--I had all my transcripts in and official DAT scores, LORs, etc. I KNEW October was on the very late side, but I had to wait that long since I didn't have time to study for the DAT before that due to personal circumstances. For me, it was worth it to wait until I felt ready to take the DAT because I ended up very happy with my score. My experience was that I was invited to interview at 7 of the 8 schools to which I applied, all at different times. I chose only to interview at four of them and I was accepted to all four schools. However, the MAJOR MAJOR MAJOR disadvantage of applying late is that you have a significantly smaller chance of hearing back from all of the schools in the same time frame. This means you may have to shell out mega bucks to hold your place at a school you don't really like in order to see if something better comes along; repeat the cycle. However, this might happen regardless of when you submit if you are not a very strong candidate. I interviewed with some people in February who had submitted their apps in July, so go figure. All I can say is rolling admission sucks and we should all lobby to have it done away with.