This Wordpress Plugin allows you to add CSS switching to your theme without any reload. It also stores the users selection for future visits. This plugin uses UDASS The Unobtrusive Degradable Ajax Style Sheet Switcher.
The Unobtrusive Degradable Ajax Style Sheet Switcher combines the power of Server Side processing and DOM scripting to swap style sheets on the fly with the power of Ajax. If JavaScript? is disabled - UDASSS degrades gracefully to improve your website accessibility. Needless to say, it is very sexy indeed.
I'm a Lead Web Developer and Web Manager in Ventura CA, I contribute to the Wordpress community through 
