Oxford Art Online [24/7] - Comprehensive art resource from Oxford University Press, comprising of the Grove Dictionary of Art and the Benezit Dictionary of Artists
Art and Design at Westminster Reference Library - Find out about the extensive collections held by Westminster Reference Library, which include Fashion and Photography, with links to other art and design information sources in London.
Fashion Monitor [Available for free in Westminster Reference Library]Powerful fashion industry online database. Whether you are creating for the catwalk, running with the rag trade or eking out employment op portunities in the industry, this is your key to success, with thousands of contact details, event announcements, job adverts and up to the minute news items on what is going on, down and up in the world of clothing and accessories.
National Art Library - Major art reference library site, including access to the library catalogue.

Burlington Magazine Index [IHS] - The journal covers Fine Art and Decorative Arts and is stored in Westminster Reference Library (from 1903 to present). This index is accessible in all Westminster Libraries and goes from 1903 to 1987.
londonart - "Shopwindow" for commercial art galleries, including works for sale in a wide range of media.
Artists Information Company - Website of a-n magazine. Practical advice and information for artists.
Artcyclopedia - Database of thousands of artists and artworks, searchable by name, movement, medium, subject, gender or nationality.
Art Sales Index - Get an idea of how much that painting in your attic might be worth with this database of prices, which includes small pictures of the work in question. Also listed are prices of sculptures, miniatures and prints.
Art UK - This project aims to display all publicly owned paintings in the UK. So far it has approximately 200,000 oil paintings and will expand to include other media such as watercolours and sculptures. It also has information about the pictures such as their locations, who painted them and more.

Best Photography Forums - rather than us suggesting the best forum why not pick your favourites from this useful list?
Flickr - With Flickr you able to post your pictures for viewing by your friends, or indeed a wider audience. You can also search and browse through the thousands of pictures others have posted.
PhotoGraphicLibraries - Gateway to photographic & related resources, including agencies and archives.
Moving Image Gateway - Gateway to websites that relate to moving images and sound.
Photography genres and professions - Useful listing of the range of photography specialisations. US salary ranges, terminology etc. so not all details will apply in UK.

The British Postal Museum & Archive - Find exhibitions, events and information about stamps of the past.

Open City - Open City is the new name for Open House which celebrates some of London's most significant architecture by opening buildings to the public.
Architecture.com - Site from the Royal Institute of British Architects.
Images of England - Images of the listed buildings of England. Aims to eventually be comprehensive (ie: nearly 400,000 buildings), but even now covers several thousand.

Fashion Era - Good mixture of historical and modern fashion articles and pictures.
About Women's Fashion - Has a strong emphasis on current fashions, but also has historical material.