In the prior incarnation of my site, I had a 404 handler that reported broken links to me so that I can set up an appropriate redirection to the intended content. Until today, that functionality was missing in WordPress. However, I found a plugin that brings that functionality to WordPress.
The issue with my broken link handler and WordPress is that when using pretty URLs with WordPress, a URL like http://gurganus.name/brant/foo is rewritten by Apache to be http://gurganus.name/brant/index.php/foo. Apache finds index.php, and it deals with loading the appropriate content. That’s the issue though: Apache found index.php. Consequently, my broken link handler was never invoked when it was under controlled by WordPress. I installed the 404 Notifer plugin though, and it seems to satisfy my desire to know about broken links so that whenever possible I can address them.