404 Notifier
If you’ve decided to move things around on your site, you might overlook a few redirects and end up with some broken URLs. This will help you catch those so you can take care of them.
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404 Notifier keeps a log of 404 (file not found) hits on your web site, along with the referring URL if there is one. You can receive e-mail notifications of these hits (careful, this may be more than you want) , or you can subscribe to an RSS feed of them (recommended).