If you want us to roll one out, it's time to show some love:
Bug 24551 - Home Tab GA - Requested Layouts & Features 
(some other good one's linked in there to vote for as well)
Another example:
-Some jumping off points for it:
script.aculo.us - web 2.0 javascript Prototype JavaScript framework: Easy Ajax and DOM manipulation for dynamic web applications
(I'll see if I can get the customer to share it...)
Edit-
MOTD on the outside:
[SOLVED] AJAX Ticker On Login Page