Fresh from The Daily WTF: The Department of Health and Human Services' Usability group demonstrates how seriously they take their own advice (the joke might not be there by the time you click on the previous link - if so click here for a screenshot. It's funnier if you see the real thing though).
p.s. Not to mention their hideous use of table-based layouts and image maps, which violate basic usability concepts. Ugh! It's the 21st century, people! Although to be fair, "New Usability.gov Design to be Launched in June 2006" (from the homepage).
p.p.s. Saying "Your tax dollars at work" would be such a cliche, no?