Adam Erstelle

Upon installation and activation, this plugin will add the necessary code to your pages to take advantage of the approaches to getting the IE6 PNG Transparency issue solved.

HITS- IE6 PNGFix

Adds IE6 Compatability for PNG transparency, courtesy of multiple choices for PNG fixes available

keegnotrub

An update on the incredible Art Direction plugin by Noël Jackson (http://noel.io) and Dave Rupert (http://daverupert.com). Allows you to enter custom CSS to be applied per post/page.
Additional features include:
<ul>
<li>Optionally place span classes on your post/page title characters </li>
<li>Optionally place span classes on your post/page title words</li>
<li>Ability to responsivley use viewport units on post/page title</li>
</ul>

Artsy

Art Direction for WordPress - Allows you to enter custom CSS to be applied per post/page.

HITS- IE6 PNGFix vs Artsy