good spam

This is what I got in my inbox a few minutes ago:

We found the following 9 broken links on

On page : Not Found : Not Found
On page : Not Found : Not Found

For just $5 (US) per month we will check your website regularly, and warn you of any future broken links. Your website's visitors will thank you for it. [direct paypal link]

The broken links he sent were correct - so the email was pretty helpful, and I would consider it if it was a little cheaper. That's what I call good marketing.