I have switched to Thematic theme on this blog over the weekend. I created a child theme after playing around with the customization hooks. I added a widgetized area below main asides, did some css modifications and created a three column, flexible layout just the way I wanted. I am so glad I switched to Thematic. ThemeShaper forums are very helpful. These articles were just what I needed to get started : How to make a child theme for WordPress and How I used a WordPress Child Theme To Redesign My Blog.