CustomError
TURN DEAD LINKS, 404s AND OTHER SITE ERRORS INTO GOOD TRAFFIC (& SET UP IIS ERROR PAGES EASILY). A ? page cannot be found' message on your site might as well be ? STOP? to your users. To get them back on track, CustomError for Microsoft IIS allows developers to add their own error pages (or... CustomError is compatible with any popular scripting language, including ASP, ColdFusion, and Perl, and is designed to work seamlessly with other Port80 products like URLSpellCheck and PageXchanger. ... Take advantage of wasted traffic by redirecting your dead links to new content and saving your SEO...
http://www.customerror.com/download/cesetup.exe - 1Mb - Download - Screenshot