Dance Valley
Find out more about Amsterdam's biggest dance festival.
http://www.dancevalley.nl/

Experience Amsterdam
Dance clubs: venue list.
http://www.experienceamsterdam.com/tours_music_clubs.htm

Holland Clubbing
Mainly devoted to Rotterdam, but contains information on the scene in Amsrerdam too.
http://www.hollandclubbing.com/

Simply Amsterdam
Index of Amsterdam dance clubs.
http://www.simplyamsterdam.nl/goingout.htm