So I am planning on going to the Apple store later today to buy myself the MacBook 1.83 GHz. I am sooo excited I can hardly contain myself! Anyway, since I just now pretty much decided against ordering a BTO machine online from Apple and having to wait 3 weeks or more, now that I am going to buy one in person, I wanna make SURE I get the latest revision possible... Someone told me the 3rd and 4th digits of the serial # on the box is what I need to look for. Is that right? What is the most recent production week I should be looking for? Many thanks!