One of the best link checking tools I have found is provided by the W3C (World Wide Web Consortium). It will check links within your site and links from your site to third party sites. Always a good idea to keep your links clean and functioning.
http://validator.w3.org/checklink
It is free. However if you plan to make a lot of use of this tool consider making a donation, since the W3C is community supported. The W3C also has great HTML and CSS validators among other tools.
March 30, 2010 - Search Engine Academy, provider of search engine optimization (SEO) training at locations across the United States, Canada, Asia and Australia, today announced it is gearing up for its fifth anniversary following last year’s strong growth. In 2009, Search Engine Academy held over 40
workshops around the globe and opened new Academies in [...]
The Search Engine Academy has been busy keeping our search engine optimization and marketing class material up to date and we’re pleased to offer the following expanded and updated sessions in our upcoming workshops.
SEO for Video
Social Media Beginner and Advanced Stragegies
Local Search for Beginner and Advanced Students
PPC Training for Beginner and Advanced Students
Expanded Analytics Training
Expanded Keyword [...]