This error.log entry confused me:
[Wed Jun 11 17:09:03 2008] [error] [client 72.30.215.46] \ File does not exist: /var/www/that-darned-site/SlurpConfirm404
Looking it up in Yahoo Webcrawler FAQ unconfused me.
(After I’d looked it up, I saw that the IP is owned by Inktomi Corp. – ye olde searche outfit.)