London:
Visit London: The city's own website.
London Town: Hotels, Theater Tickets, Tourist "Reviews"; you name it, this site has it!
The Underground: The official subway of London. Move over New York City!
Museum of London: One of London's many museums.
England:
Visit Britain: The official website for Britain.
The FA: Football (soccer) is the passion of many around the globe; this is the London team.
Lonely Planet: England - Lonely Planet's online guide to everything England.
The Travel Library: Information on many cities in Britain (as well as other coutries).