Just a small note from over on the PHPKitchen, there's a new plugin for all of the Mozilla users out there that will allow them to view the headers they're being sent in a handy-dandy little window.

One of the best extensions to Mozilla is the Live HTTP Headers. This extension gives you the ability to view the HTTP headers that are passed between your browser and the web server. If you for example are trying to debug a cookie problem or a MIME header problem you can view all the details of the HTTP headers with this extension.

This can be invaluable when you really need a peek at the headers for a script you're working on (and don't want to telnet into the webserver to try to fish them out). So, if your browser of choice is Mozilla, you really should give this plugin a try...