• Guardian
• Guardian Podcasts
• Observer
• Daily Mail
• Times
• Daily Mirror
• Daily Telegraph
• British Library Paper Archive

• Another Nickel in the Machine
• Little London Observationist
• Spotted by Locals
• TimeOut London
• Transport for London
• Visit London
• Walkit.com London
• Your London

Travel outside of London

U.K.

• BritainUSA (US British Embassy)
• Fancyapint (pub guide)
• National Rail
• National Trust
• Ramblers (walkers organization)
• Travel Wales
• U.K. Travel (about.com)
• Visit Britain
• Visit Highlands (Scotland)
• Walking Britain
• Geograph British Isles
• Ordnance Survey Open Data (maps)

Europe

• Eurocheapo
• Europe for Visitors
• Mappy.com
• Rick Steves' Europe thru the Back Door
• World Subways

• Daily Telegraph sports page
• BBC Sports
• Chelsea
• Fulham
• Brentford
• Gray's Athletic
• Hillsborough Justice Campaign
• Footiemap.com
  

• Museum of Rugby
• Wembley Stadium
• Cricket schedule
• Wimbledom Museum
• Lord's
• BBC Olympics 2012 page
• British Olympic Association
• Politics & Sport (Guardian)

• BBC People's War
• Britain and WWII
• Civvy Streets in WWII
• History Learning Site
• Spartacus Educational WWII
• National Archives Art of War exhibition
• Britain at War
• 1940 Chronicle

• British Museum
• National Gallery
• National Portrait Gallery
• Tate Britain
• Tate Modern
• Victoria and Albert Museum
• Vinopolis
• Bath:
• Roman Baths
• Costume Museum

• Natural History Museum
• Science Museum
• Museum of London
• Royal Observatory Greenwich
• Darwin Center (at NHM)
• Thames Barrier Park
• Kew Gardens
• National Maritime Museum
• Stonehenge
• Oxford
• Cambridge:
• Visit Cambridge
• Fitzwilliam Museum

Miscellaneous useful info

• Great British Venn Diagram (clear explanation of differences between UK, Gr.Britain, etc.)
• British Empire
• Voting info (Texas)
• Voting info (all 50 states)
• Sunrise/Sunset times
• Fahrenheit & Celsius Scales
• Universal Currency Converter
• BBC Democracy Live

Blogs

• Postcards from Across the Pond
• Hail Britannia
• Smitten by Britain
• Separated by a Common Language
• Anglotopia.net
• Emm in London
• Just a Plane Ride Away

• British Library (Crace Collection of Maps of London)
• CILIP (Chartered Institute of Library and Information Professionals)
• London School of Economics Library
• National Archives (Cabinet Papers—info on government)
• Office of Public Sector Information
• SCOOP (Standing Committee on Official Publications)