If you live in the United Kingdom or Continental Europe, or if you ever go bird watching there, you might find Surfbirds.com’s Online Identification Guide to the Birds of Britain and Europe very useful. The guide has a quick way of narrowing down bird identification using four simple questions, as well as ways to search by broad criteria such as habitat and type of bird. You can also search for, or by, common names and scientific names. Visit the galleries - the pictures are excellent.
The guide allows you to search only for British birds, and a link on the page: “Surfbirds Where to go Birding in Britain,” allows you to search for good bird watching sites near your location. This is sure to be a great resource for birders in Britain.