cAAl : Your post should be manatory reading. If there is ever a permanent "AmsterdamTips" sticky, it should be at the top.

"AMS Layover Tips" :
http://www.flyertalk.com/forum/showthread.php?t=394739


Watch Out For Pickpockets !
On the train to Centraal , groups of youths wander through the train playfully jostling each other as they try to pick your pockets .

Beware of street people/junkies who ask you if you speak English , 'cause they'll cling to you to beg and won't stop. Just ingore them or say 'Niet'.