Britain Express
London's history from Roman times to the Blitz.
http://www.britainexpress.com/London/history-of-london.htm

Britannia
Offers an in-depth look at the history of London, with one chapter devoted to each major era.
http://www.britannia.com/history/londonhistory/

London 1690
View London through the ages, from 1690 onwards, using image overlays.
http://digitalurban.blogspot.com/2006/01/london-google-earth-1690.html

Story Of London
Discover the great, the strange, the seedy, the criminal and the downright ordinary past of one of the world's great cities.
http://www.storyoflondon.com/

Talking Cities.com
Covers over 2,000 years of London history.
http://www.talkingcities.co.uk/london_pages/history_main.htm

The Victorian Dictionary
Tells you everything you ever wanted to know about life in Victorian London.
http://www.victorianlondon.org/

Things To Do In London
Gives a brief overview of the city's history from Roman times to the present day.
http://www.thingstodo-london.com/brochure/content.jsp?FIELD=History