Through the use of a tool such as Open Site Explorer you can gain information in the server status of your most linked content. You may find out a site page that went viral last year and gained a ton of links has since been deleted from the server and displays a 404 code. Additionally, you may also see that a heavily linked page has since been temporarily redirected and is in need of a permanent redirection.
Finding a few of these can result in a few quick redirects to help boost the link value on the domain.
