Hey there,
Interesting idea with the OPML export. Unfortunately, there's no immediate, direct way to style this XML page without jumping through some hoops. You can see two examples of how to style XML by looking at our Browser Friendly service's effect on a FeedBurner feed. Here's the "Burning Questions" feed, which is from FeedBurner's official blog:
http://feeds.feedburner.com/burnthisrss2
If you View Source on this feed within your browser (don't use Apple's Safari for this purpose, however -- try Firefox or IE), you'll see two entries near the top:
<?xml-stylesheet href=" http://feeds.feedburner.com/~d/styles/rss2full.xsl" type="text/xsl" media="screen"?>
<?xml-stylesheet href=" http://feeds.feedburner.com/~d/styles/itemcontent.css" type="text/css" media="screen"?>
The first one applies XSLT styling, if the browser supports it. (IE5.5/6.0, Firefox/Mozilla, and Safari 1.3 all do.) XSLT gives you a great deal of control over how XML is visually formatted. Do a few searches on 'XSLT' to learn more about this open standard XML technology and how it combines with CSS to create very webpage-like presentations of XML data. XSLT gives you much greater control over how XML data is organized and presented in a browser window, but it's a fairly persnickety, complex language and syntax to use.
The second entry acts as a backup to XSLT for browsers that do not support it, but still know how to display XML documents, such as RSS feeds. It applies a CSS stylesheet to the XML. You should be able to adapt this stylesheet to OPML (it's just XML, after all) in order to achieve the effect you're looking for -- a 'friendlier' display of XML data.
I'd start with trying to apply a simple CSS style sheet to OPML, using our itemcontent.css sheet as a guide. Then, if I wanted a bunch more control over the output, I'd try working with the XSLT stylesheet. Sorry we don't have a solution for you that's ready-to-eat, but hopefully this discussion gives you some creative inspiration. Please do let us know if you come up with anything nifty; we might even feature you on our Publisher Buzz site.