/ Published in: PHP
To use it, simply create a new folder called “art-direction†in your theme. Then to style any particular Post or Page, just drop a file in that folder named style-XXXX.css where XXXX is the ID of the Post or Page. When that Post or Page loads, WordPress will look for a file of that name. If it exists, it will load in in the head section.
URL: http://digwp.com/2010/02/custom-css-per-post