This hack adds a style/theme manager to the WordPress admin panel and allows a blog owner to choose a style to be displayed. Addition of styles is as simple as creating new folder for styles and copying them to a wp-style folder in your WordPress folder. This hack is also Alex’s Style switcher compatible, though the tutorial is not updated with that info. It will be in a future release. This hack comes with 2 styles from the CSS styles competition.
Here is the link to the hack http://weblogtoolscollection.com/b2-img/wp_styles.zip
You can see it on display here
Please post bugs and feedback here.