The night before the event:
Disconnect the battery, and if you have the facility, perform a full throttle body realignment. This will sharpen the throttle body response, and remove some of the build up of 'gank' from the ECU which could slow the car back a bit.
Make sure you're running a clean air filter, and your plugs are in good nick (you can get a very reasonable set of Iridium plugs on t'internet from NGK for about £8 each). Plugs can make quite a difference as a fresh decently gapped set will offer much better burn.
Get some decent fuel in the tank (Optimax), preferably for a couple of tanks to allow adaptation to take place.
Remove spare wheel and any unneccessary guff from the car. Practice some starts.
Optimise your tyre pressures for 1/4 miling (don't know what these would be, but I'm sure I have read lower fronts by upto 5psi, leave rears as they are, or increase slightly).
Have no more than 1/2 tank of fuel on board on the day, fuel is weight!
Don't allow the engine to heat soak in the queue, keep turning it off if the queue is long.
Turn off ALL electrics during your run (fans / lights / radio) as this will drain power (and turn ESP/TCS OFF!)
Don't over rev the car between gear changes. Red lining isn't where all the power is on an OEM car. There is a drop off of power / torque which comes before the red line. Try to change as close to this point as you can, and make the gear changes smooth but slick, blipping the throttle if you have the clarity of mind before re-engaging each gear). It's often such a blur its difficult to do this well.
Any other tips to give the man a slight advantage?