Dead Link Checkers
To avoid poor rankings in search engines, it is important to remove dead links from your web pages. Killing those dead links will also please your visitors!
Many web development software packages, such as Microsoft FrontPage and Expression Web, include functionality to find dead links. A number of free link checkers are also available on the Intenet.
This link checker is W3C's easy-to-use HTML validation service, based on an SGML parser.
Submit Express offers a dead link checker and number of other tools for the webmaster.