I don't think you should feel the need to make things look pretty on BlackBerry browsers, especially ones pre-4.6 (and even then, yeesh). Sure, keep things organized, but making things look nice on a specific browser is way too frustrating and short lived. For example, here's an unordered list (<ul>) with some CSS Style, and look at the difference between 4.2 and 4.3:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Hello.</title>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
<style type="text/css">
body{background: #FFFFFF;font: 85% Calibri,sans-serif;}
h1{ font-size:120%; color: #06F;}
h2 { font-size:110%; color: #06F;}
h3 { font-size:105%; color: #F60;}
ul { list-style: none;}
a{color: #00F;text-decoration:underline}
div#container{width:280px;}
</style>
</head>
<body>
<div id="container">
<p>
<ul>
<li> </li>
<li><p><h2>Your BlackBerry App</h2></p></li>
<li>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer vitae nulla sit amet ligula sollicitudin suscipit ut eget turpis.</li>
<li> </li>
<li><a href="resources">Tools</a></li>
<li> </li>
<li><a href="builds">Builds</a></li>
<li> </li>
<li><a href="">Another link</a></li>
</ul>
</p>
</div>
</body>
</html>