(click for schematic - 3 STK-S4, 1 Volume, 1 Tone, 5 Way Switch, 3 Splits)
(click for schematic - 3 'Lil Humbuckers, 1 Volume, 2 Tones, 5 Way Switch, 3 Splits)
For those of you who are going with a full set of stacks or Lil' sized humbuckers, and would like to still be able to get single-coil sounds---or at least keep that classic Strat 'quack' in positions 2 & 4 on your switch---this is an easy way to split all three pickups with only one standard dpdt push/pull pot (or mini-toggle if you prefer---they both wire the same way).
When the switch is down, the pickups are all running in hum-canceling mode.
When the switch is up, the pickups are all in single coil mode. In the 'up' position, both diagrams essentially turn your guitar back into a single-coil strat. The advantage of this is that positions 2 & 4 will sound correct, and give you that classic 'in-between' sound (and they will be hum-canceling, like they should be).