Canadian Directory of Special Collections - http://www.collectionscanada.gc.ca/collectionsp/index-e.html
Provides a list of places in Canada that house special collections and list some information on the material, including dictionaries, that is held in the various institutions.
Pidic.com - http://www.pidic.com/
An online picture dictionary that is designed for children and young teens.
wordIQ - http://www.wordiq.com/
Allows users to search through many different dictionaries at the one time including some encylcopedia's as well.