I've recently been honing my wbesite back into some resemblance of order, repairing all the bits of rot incurred by changing physical hosts, restoring from backups after break-ins, etc. over the past few years. This was in part inspired by a recent mentioning of my site over there:
http://alum.mit.edu/ne/opendoor/200505/index.html
Below is the message submitted to Microsoft (not on their "report a bug" thing though since you have to call do that.) I used a Dominus quote as the subject, "You can't just make sh!t up and expect the computer to know what you mean, retardo!"
As if it was not brilliant enough to mysteriosuly have Internet Explorer randomly start GETing /favicon.ico now WMP tries media.smi for any media.foo link. And ohh! Get this, it looks for the SMIL file after the content, that's useful; get the presentation structure after the content. Here's an idea, if I, as the webmaster *wanted* the user to view something in a SMIL presented format I'd actually make one and link to *that*.
The least you could do is HEAD first.