1.Within <description></description>, $author,$threadTitle,$time are all redundant.
2.<span class="postbody"> </span> seems redundant as well after you take the above arguments out.

If possbile, please take them out. It will make the description look better in regular rss readers.

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<item>
<title>卜鹰 : 你天天操的啥心？</title>
<link>http://www.haiguinet.com/bbs/viewtopic.php?p=936889#936889</link>
<pubDate>Sat, 18 Mar 2006 06:10:53 GMT</pubDate>
<guid isPermaLink="true">
http://www.haiguinet.com/bbs/viewtopic.php?p=936889#936889
</guid>
<description>
作者: <a href="http://www.haiguinet.com/bbs/profile.php?mode=viewprofile&u=17375" target="_blank">卜鹰</a><br />
主题: 你天天操的啥心？<br />时间: 18 3 2006 06:10 (GMT 0.00)<br />
<br /><span class="postbody">
去主贴上看看<br />_________________<br />无酒向佛，有酒学仙。</span><br />
</description>
<dc:creator>卜鹰</dc:creator>
<dc:subject>海归风情</dc:subject>
<annotate:reference rdf:resource="http://www.haiguinet.com/bbs/viewtopic.php?p=936604#936604"/>
<comments>
http://www.haiguinet.com/bbs/posting.php?mode=quote&p=936889
</comments>
</item>