Last modified: 2010-05-15 16:03:41 UTC
The URL above should look like <message name="thismessagedoesntexist"><thismessagedoesntexist></message> rather than <message name="thismessagedoesntexist">&lt;thismessagedoesntexist&gt;</message> (in the HTML source, this is &amp;lt; which should be &lt;)
Oh wait, wfMsg('foo') actually returns "<foo>" ... so this is not a bug