I think this is the canonical source of links and information about the U.K and Europe canal system. Hours of reading.

One example I found interesting was the UK Inland Waterway Size Restrictions in English Units - make sure your boat will fit :-)

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George's:

Canal Boating in the U.K. and Europe

(with some North American information)

Being an introduction for those unfamiliar with the pleasures of canal and waterway cruising, as well as a resource for experienced boaters.

Nearly 2000 links to canal and waterways related web sites.

Since 1995...
Still comprehensive.
Still non-commercial.