I’ve taken the 7 default style sheets that come with MovableType and added them in as alternate stylesheets to the template for my main page.
So, those of you with browsers that can deal with alternate style sheets like Mozilla or Firebird (don’t know if IE or NS do alt style sheets) can use the little Style button at the bottom right of your status bar (Firebird) or the View/Use Style menu (Mozilla) to switch between the different styles and see what the different CSS styles look like.
One of these days I’ll get around to learning enough CSS to create my own styles.