investigate the links on your site with xenu’s link sleuth

Dan Morrill points over to Xenu’s Link Sleuth (Windows tool):

Xenu’s Link Sleuth (TM) checks Web sites for broken links. Link verification is done on “normal” links, images, frames, plug-ins, backgrounds, local image maps, style sheets, scripts and java applets. It displays a continously updated list of URLs which you can sort by different criteria.