help identifying mysterious puddle on driveway?

[MikkiJayne]

Soak some up on a bit of white paper to get a better idea of what it is.

Pale pink and watery - coolant
Clear & odourless - AC condensation
Green (fresh) / light brown (old) - PS fluid (usually driver's side)
Light brown & stinky - diff oil
Light brown (fresh) / dark brown (old) - engine oil
Yellow (fresh) / grey brown (old) and a bit fishy - gearbox oil
Bright red - oops, check for missing or damaged digits