
http://tricord.be/heel-and-toe.avi (~63MB )
This downshifting technique has several advantages, it prevents wheel lifting due to underspin when letting go of the clutch, it prevents synchromesh wear in the gearbox and if done right is faster than a 'regular' downshift. This is the procedure:
1) start braking
2) without clutch, go from gear to neutral
3) without stopping to brake, tap the gas with your heel
4) engage the clutch
5) downshift from neutral
6) release the clutch
7) floor the gas as you come out of the curve

There is a more complicated but easier-to-do version which involves the clutch before and after step 2). I do it this way though, it's even faster and has the same effect if you time step 2) exactly right. See vid for how I do it.
Needless to say, it was a blast. We got rain during the sunday afternoon so we got pretty good at drifting as well
