Amsterdam Boat Events
Enticing meals on board classic ships.
http://www.amsterdamboatevents.nl/

Amsterdam Canal Tours
Offers an overview of the various canal tours available in the city.
http://www.hotel-bookings.nl/amsterdam-canal-tours.html

Classic Boat Tours
As the title suggests.
http://www.classicboattours.nl/

Classic Canal Charters
Canal cruises in Amsterdam and beyond.
http://www.classiccanalcharters.com/

Daytripper
Take a tour of Amsterdam's canals in a lifeboat.
http://www.ticket-to-ride.nl/

Lovers
Offers canal boat tours. The website is in Dutch only.
http://www.lovers.nl/

Nemo Tours
Canal cruises onboard a sloop.
http://www.nemotours.nl/

Paradis Private Boat Tours
Arranges boat tours of the historical Jordaan area and the famous Red Light district.
http://www.privateboattours.nl/

Simply Amsterdam
Index of various tours and excursions in Amsterdam, including boat tours.
http://www.simplyamsterdam.nl/services.htm

Waterlelie Rondvaart
Boat trips.
http://www.xs4all.nl/~waterlel/