Amsterdam
The comprehensive description of what Amsterdam has to offer is available at Steven Pemberton's website http://homepages.cwi.nl/~steven/amsterdam.html.
A brief article on Amsterdam appeared in the [http://travel.nytimes.com/2007/04/22/travel/22amsterdamweb.html New York Times] on April 22. If you don't have or want to get the free account, see [http://www.bugmenot.com/].
David Reid has posted a [http://feathercast.org/?p=44 Feathercast] Podcast about visiting Amsterdam for [ApacheCon].
Queensday
Queensday Amsterdam : http://koninginnedagamsterdam.nl/?en