Anyone have any Pinewood Derby tips/tricks?

Put the weight as far behind the rear axel as possible, if you are looking to be legal (as you should be in a cub scout event) no rounding of the tires or wheels is allowed, total length is measured, total width, and as was stated align the weight on each wheel by sitting it on a very flat surface and gently pushing down on each corner of the car to feel for even loading, some say they are faster with the most weight on two wheels by installing the axels slightly lower into the body, My experience was evenly loaded was fastest. There are more tip's in the pinewood grand Prix rule/handbook and yea give it a decent coat of paint. as a sponsor/official I'd say get the official rulebook and don't bend the rules....winning isn't everything when rules are broken to do so. We made trophy's from vacume advance covers and spark plug's, (all participants were given a hot wheel's car) invited a local highway patrol officer to be the judge of who won the races, and got a local pizzaria to host the event(they went over and above) and gave out gift certificates and a decent discount for those in attendance