This was tested out on the Bueno Woo theme, but it should work on the others as well. Just please save a copy of the original code in notepad or something before you start changing templates. ??
Okay, I figured it out.
First I had to put the following in the custom css box:
#logo { }
#logo img { display: none; }
#logo .site-title, #logo .site-description { }
to override the logo as title setting.
Then, thanks to RVoodoo’s reply, I went to the header.php in the Editor and replaced this:
<a href="<?php bloginfo('url'); ?>" title="<?php bloginfo('description'); ?>"><img class="title" src="<?php if ( get_option('woo_logo') <> "" ) { echo get_option('woo_logo'); } else { bloginfo('template_directory'); ?>/images/logo.png<?php } ?>" alt="<?php bloginfo('name'); ?>" /></a>
With this:
<h1><a href="<?php bloginfo('siteurl');?>/" title="<?php bloginfo('name');?>"><?php bloginfo('name');?></a></h1>
<h2><?php bloginfo('description'); ?></h2>
From there you could just customize your title and description font.