If you've ever inherited a gigantic content-heavy site where freewheeling webmasters of the past created HTML you have a hard time bringing yourself to look at, you know what a pain link checking can be. I'll be the first to admit I once took a see no evil/hear no evil approach, assuming that every link on the site was fine until some helpful web user emailed me to tell me otherwise. Meanwhile, I'm sure the site's broken links were repelling more than a few casual visitors to the site. It's not a time I'm proud of.