TopReference.com offer reference website links to browse for education, libraries, dictionaries, colleges, universities, k-12, language schools, book and magazines.

Directories

Listings
Searchable directory of free online maps.
http://www.mapdigger.com/
Personalised, content-rich mapping and navigation service for the UK.
http://www.mapminder.co.uk/
Listing of map and travel publishing and retailing websites.
http://www.mapville.com/