Fiddler

A HTTP Detective Story by Eric Lawrence shows how:

1 - resoundingly useful the Fiddler tool that Microsoft have released is.
2 - resoundingly stupid some people can be.

Non-withsthanding the fact that Internet Explorer (pre XPSP2) returned the referer header when it shouldn't, the person that "exploited" this "functionality" is stupid. It's the same as "just because a bank doesn't prevent you writing your PIN number down" equating to "because you can, you should". Pah - muppets!