like benmen said a sat-phone and GPS would come handy, but he forgot the PLB's ! <img src="images/graemlins/smile.gif" alt="" />

in a plane crash first priority is medical attention.
since contollers usually know weather a plane crashed or not, he/she proberbly will sent a SAR unit out, so signalling would be importent to. ( make fire, make ground to air signs on the ground, etc. ) unless you got the GPS, sat-phone or PLB.
in the mean time build a shelter incase the weather turns bad or nobody is seaching for you.
after that get your self hydrated ( in a hot inviorment i would get some water first and than build a shelter, if the weather looks good... ) And than food...

so you need:
-medical suplies
-signal devices
-shelter building equipment or a shelter
-water or water producing equipment
-food or food producing equipment ( traps, snares, etc. )
( got a strange feeling i forgot something... )

And make sure you don't end up like the folks in the lord of the flies !