Quick tip on checking HTTP headers
In the course of the difference web type things i've written, one thing that is especially useful is the ability to see the HTTP headers being passed back and forth.
There's some very interesting products out there that let you see what's going on, but most of them involve running a local proxy to do the logging/viewing.
I thought i'd mention a product that i've had a lot of good experiences with, and it doesn't require a proxy.
ieHTTPHeaders is an explorer bar for IE that shows the request and reponses headers as you surf. Highly recommended :)
Have a read around on his site. He's done some interesting things, and the way he made this program work is very tricky indeed.