Amsterdam.nl
Contains information on the religious affiliations of Amsterdam's citizens and on the history of religion in the city.
http://www.amsterdam.nl/asp/get.asp?xdl=../views/amsterdamnl/xdl/Page&
PosIdt=00001229&ItmIdt=00001229&SitIdt=00000005&VarIdt=
00000002&referer=00000494

AmsterdamBy.com
A list of churches, mosques and synagogues in Amsterdam.
http://www.amsterdamby.com/tourist/tour5.htm

YAPC Europe
Index of churches in Amsterdam with services in English.
http://www.yapc.org/Europe/2001/about/worship.html