Totoro
Senior Retro Guru
the best way to remove nails from pallets is to set fire to the pallets. You will have a lovely pile of metal at the end of the process.
a pinpointer is as good of a method as any and you can by stupid expensive one's just for wood workers with fancy names printed on them. I've never bothered but know a few people who have and they all get mixed results.
I made a documentary about it a few post up