When exporting in OPML, the attribute of the "outline" element in which the XML URL is stored is supposed to be "xmlUrl", not "xmlurl" (i.e. the "u" is supposed to be "U"). See "http://feeds.scripting.com/whatIsOpml" (and recall that XML attribute names are case sensitive).
(David Chess, chess@theogeny.com)
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Fixed in 0.1.3. I don't test the OPML features much, so I hope you are
right about this one. (not "right" in the sense that the "spec" (if you can
call it that) says it should be xmlUrl, but "right" in the sense that this
changes makes the OPML work in more aggregators, not less)