At the 456 Berea St blog today, there's a popular new post that demonstrates a simple (yet effective) method for switching out the style sheets on your site at the whim of the user.
Using PHP to let the user switch to a different CSS file is nothing new. But it is one of the things that I am often asked about, so I thought it would be good to have a write-up to refer people to in the future.
The code for the switcher is only about five lines long, implementation and all, but it's a nice, clean way to do it. It would break if the viewer didn't have cookies allowed on their system, though.