This issue may be the same over here: http://core.trac.wordpress.org/ticket/17767
Its currently submitted as a bug and hasn’t been fixed yet. You can give the supplied attachment a go to see if it fixes the issue for you.
<description>Ou mettre des – à la place des -
Mais oui la solution de rcommande fonctionne bien :)</description>
<content:encoded><![CDATA[<p>Ou mettre des &ndash; à la place des -<br />
Mais oui la solution de rcommande fonctionne bien <img src="http://mart-e.be/wp-includes/images/smilies/icon_smile.gif" alt=":)" class="wp-smiley" /> </p>
]]></content:encoded>
You can see in your feed that the – is properly encoded in content but not the description.
Quick fix is to delete the comment with the – in it.
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