This site has indexed entries in Phillimore marriages, Who Was Who, school and college registers and returns of owners of land from 1873. You can also browse the published parish registers of over 500 parishes in England with Lancashire having the best coverage.
http://www.uk-genealogy.org.uk/index.html
Information about life in Britain taken from census data. Various themes are explored such as Population, Life and Death, Industry, Work and Poverty etc. There are also descriptions of places from travel writers and gazetteers as well as a collection of historical maps.
http://www.visionofbritain.org.uk/index.jsp
Database of over 160,000 UK place names many of which are also linked to maps.
http://www.digital-documents.co.uk/archi/placename.htm
Digital library of material relating to the history of Britain including many of the Victoria County History series.
http://www.british-history.ac.uk
This gazetteer covers places in England, Ireland, Wales, Scotland and the Isle of Man and links to other pages on the Genuki site.
http://www.genuki.org.uk/big/Gazetteer
Search three 19th century gazetteers - Imperial Gazetteer of England and Wales (1872), Ordnance Gazetteer of Scotland (1885) and Gazetteer of the British Isles (1887).
http://www.visionofbritain.org.uk/descriptions/index.jsp
The Gazetteer of British Place Names lists over 50,000 place-names along with their national grid reference. It lists the historic county and also the names of the most important administrative areas within which each place lies.
http://www.gazetteer.co.uk