I took the August MCAT, and I don't think that hurt me too much this year. The big thing is to make sure that you get the rest of your AMCAS in early or at least by the end of August. That way, schools will just be waiting on your MCATs, and your application should be complete soon after they get in. The downside to that, of course, is that you have no idea what kind of schools you should be applying to. But, after looking at your website, as long as your MCATs are decent, you should be competitive almost everywhere...