However I read somewhere that if a prospective student is interested in applying for Fall '07, he's best off taking the LSAT no later than December.
That doesn't seem right. Even if I waited until Feb 2nd that's just slightly over six months of intermission.
I want to make sure I understand you...do you want to apply in Fall of 2007 or start school in Fall of 2007? Your six month comment makes me think that you want to start applying in Fall of 2007 for the 2008 school year.
If you want to start school in Fall 2007, you have to take the LSAT by Dec 2006.
If you want to start school in Fall 2008, you have to take the LSAT by Dec 2007.
However, if 2008 is your plan, you are better off taking it before Dec 2007, say, June '07 or Sept '07 (June would be better if you are thinking this far ahead).
If you want to start school in Fall of 2007, this December is your last chance.