Don't worry, the design is stripped down just for the day. Here's the explaination by Lorelle:

This is the third year of the annual CSS Naked Day which honors web design and designers around the world who help make our websites and blogs look "pretty" to the eye while still being totally functional under the hood. Dustin Diaz wanted to give the web world an opportunity to remind everyone of the benefits of CSS web page design. By removing the stylesheet for the day, the world would see naked web pages, giving a little more appreciation for the skills of web page designers.

As explained yesterday in the Blog Herald announcement of CSS Naked Day, this is also an opportunity to showcase how usable and accessible your web page structure is even without the pretty, reminding the world that it is the law that your website must accessible by everyone using any method to access your blog.

Over 1814 blogs are participating! (I'm #974!)