And the difference between a woman and an Aircraft is, you should tie an aircraft down when you leave it
Wrong, you do the same for both.
A few things I have learned, though only an SPL so far:
1) 2 Walkarounds is a great idea.. had a run in with a pitot cover once before. (brings me to the point, mention "airspeed active (and in the right kind of place)" during takeoff roll)
--edit --
The GPS thing was a joke, I haven't and wont touch a GPS for a while.. until I've done my PPL etc. at LEAST.