The importance of links to the traffic potential of a website cannot be underestimated. Many people realize the importance of inbound links, but neglict the importance of outbound links. Its especially important to make sure your outbound links are up to date and not broken.

Here is a list of free tools you can use to insure all your links are up to date.

Dead Links.com - Excellant free tool, can take some time to complete a full website scan if your site is particularly large.

Search Engine Optimising

Link Checker Pro - Another commercial tool featuring very strong mapping tools

And, off course:

Web CEO has probably the best overall set of tools for search engine optimization around, and considering something like 130,000 people are using there software, you know your in the right hands.