This project was started by danux @ www.whatisthesuboftheday.co.uk. Check out that site to see how other people have extended this simple idea.
What is the Sub of the Day? - Displays the Sub of the Day as a widget in your sidebar.
I've also extended this a bit, there's a SOAP Implementation in Python. Check out http://bzr.zrmt.com/python/subofday/
Enjoy the code :)