[jQuery] RSS Feed trouble in IE (bug?)

[jQuery] RSS Feed trouble in IE (bug?)

Working off this sample:
<a href="http://erikandcolleen.com/erik/projects/jquery/rss/">http://erikandcolleen.com/erik/projects/jquery/rss/</a>
My sample page:
<a href="http://www.marketo.com/rsstest.htm">http://www.marketo.com/rsstest.htm
</a>
My feed is formatted atom from Feedburner.  The works fine in Firefox.
IE6/7 gives no love.
It can't find anything, which is wierd because it's not doing anything particularly special.  Is this a bug?
Thanks,
Glen