jFeed is somewhat obsolete, working only with older versions of jQuery. It has been two years since it was updated.
zRSSFeed is perhaps a little less flexible, but it is easy to use, and it works with the current version of jQuery (currently 1.4). http://www.zazar.net/developers/zrssfeed/
Here's a quick example from the zRSSFeed docs:
<div id="test"><div>
<script type="text/javascript">
$(document).ready(function () {
$('#test').rssfeed('http://feeds.reuters.com/reuters/oddlyEnoughNews', {
limit: 5
});
});
</script>