Models
Cesaroni Technology - http://www.pro38.com/
Provides detailed product information for the Pro line of rocket motors.
L'Instant Durable - http://www.instantdurable.com/
Site that has landmarks such as Notre Dame de Paris, and Chateau of the Loire Valley in paper 3D models.
Toy Steam Engines from around the world - http://mikes-steam-engines.co.uk/
Online museum. Provides images for toy steam engines as well as information about each model.