Replace the ChatterBox nodelet on http://perlmonks.org with a slightly fancier interface.
This script is a greasemonkey adaptation of my chatbox script. This script might still have some security issues at the moment. It should be reasonably safe now, but use at your own risk.
Other problems: only basic links support is provided (stuff like cpan and isbn links don't work yet).
The problems will be fixed when I've got the time to do so, or if someone supplies a patch.
updates 2005-07-11: XSS security fixes.
updates 2005-07-12: The message inbox is visible again if it's not empty. It's not updated by the script, so you'll only see new messages if you reload / visit another page.
You need the GreaseMonkey extension for Firefox to use this script.
Right click this link and select "Install User Script..." to install.