OPML 2.0 now has a namespace, at least for use as a vocabulary in other XML containers. Dave Winer selected http://www.opml.org/spec2 as the namespace URI and has already implemented it in his TwitterGram project. Here's a sample.
<rss version="2.0" xmlns:opml2="http://www.opml.org/spec2"><channel>
<title>TwitterGrams</title>
<link>http://www.twittergram.com/</link>
<description>A simple way to post short MP3s to Twitter.</description>
<item>
<title>Twenty second audio tweet! Click to play: </title>
<opml2:ownerId>http://www.twitter.com/gort581</opml2:ownerId>
</item>
</channel>
</rss>
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