I just spotted this thoughtfully crafted "JavaScript turned off" warning message on Get Satisfaction:
Not only is it a good looking message that you can't miss at the top of the page, but it's also a play on the legendary TPS report scene from Office Space. Nice touch.
When a site relies heavily on JavaScript, JavaScript turned off messages are important notices to the user. Without it, they may think the site is broken.
This requirement will be included in the next release of our book, Tick My Boxes – the checklist for building successful websites