Just to clear up misconceptions... these guys are telling you what they did and what you SHOULD do. Yes, it's definitely to your advantage to get your apps complete early, but in reality, it doesn't happen for most people. So don't give up if you can't make these deadlines. Be prepared for delays with MCAT scores, LORs, and the speed or (lack thereof) of your pre-med advisor. Schools interview through March and sometimes April, and as of now there are still plenty of spaces in most of the DO schools. If you need more time to study and take the Aug. MCAT, submit the AACOMAS in June anyway. The schools will wait to get your scores before they review it but at least there won't be any delay when your scores do come back.
I took the MCAT in aug 2002
Submitted AACOMAS aug 2004
Secondaries complete Dec 2004
Interviews granted Jan 19th-Mar 3rd 2005
Waiting anxiously to hear! Matriculate hopefully Aug 2005.
Don't be misled. As you can see with my example, this is not a quick process.