Pretty sure that you just need to format the information into XML and provide a link to the XML document.
Pretty sure you can set your system up to update the XML documnt when you update your news or announcements.
<!-- generator="FeedCreator 1.7.2" -->
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<rdf:RDF>
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<channel rdf:about="http://fun.forum500.com">
<title>Powered by Mambo 4.5.2</title>
<description>Mambo site syndication</description>
<link>http://fun.forum500.com</link>
<image rdf:resource="http://fun.forum500.com/images/M_images/mambo_rss.png"/>
<dc:date>2005-12-17T09:42:34+01:00</dc:date>
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<items>
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<rdf:Seq>
<rdf:li rdf:resource="http://fun.forum500.com/index.php?option=com_content&task=view&id=1&Itemid=0"/>
<rdf:li rdf:resource="http://fun.forum500.com/index.php?option=com_content&task=view&id=2&Itemid=0"/>
<rdf:li rdf:resource="http://fun.forum500.com/index.php?option=com_content&task=view&id=3&Itemid=0"/>
<rdf:li rdf:resource="http://fun.forum500.com/index.php?option=com_content&task=view&id=4&Itemid=0"/>
<rdf:li rdf:resource="http://fun.forum500.com/index.php?option=com_content&task=view&id=5&Itemid=0"/>
</rdf:Seq>
</items>
</channel>
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<image rdf:about="http://fun.forum500.com/images/M_images/mambo_rss.png">
<title>Powered by Mambo 4.5.2</title>
<link>http://fun.forum500.com</link>
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<url>
http://fun.forum500.com/images/M_images/mambo_rss.png</url>
</image>
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<item rdf:about="http://fun.forum500.com/index.php?option=com_content&task=view&id=1&Itemid=0">
<dc:format>text/html</dc:format>
<dc:source>http://fun.forum500.com</dc:source>
<title>Welcome to Mambo</title>
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<link>
http://fun.forum500.com/index.php?option=c...w&id=1&Itemid=0</link>
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<description>
If you've read anything at all about Content Management Systems (CMS), you'll probably know at least three things: CMS are...
</description>
</item>
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<item rdf:about="http://fun.forum500.com/index.php?option=com_content&task=view&id=2&Itemid=0">
<dc:format>text/html</dc:format>
<dc:source>http://fun.forum500.com</dc:source>
<title>Newsflash 1</title>
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<link>
http://fun.forum500.com/index.php?option=c...w&id=2&Itemid=0</link>
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<description>
Mambo 4.5 is 'Power In Simplicity'!. It has never been easier to create
your own dynamic site. Manage all your content...
</description>
</item>
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<item rdf:about="http://fun.forum500.com/index.php?option=com_content&task=view&id=3&Itemid=0">
<dc:format>text/html</dc:format>
<dc:source>http://fun.forum500.com</dc:source>
<title>Newsflash 2</title>
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<link>
http://fun.forum500.com/index.php?option=c...w&id=3&Itemid=0</link>
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<description>
Yesterday all servers in the U.S. went out on strike in a bid to get more RAM and better CPUs....
</description>
</item>
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<item rdf:about="http://fun.forum500.com/index.php?option=com_content&task=view&id=4&Itemid=0">
<dc:format>text/html</dc:format>
<dc:source>http://fun.forum500.com</dc:source>
<title>Newsflash 3</title>
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<link>
http://fun.forum500.com/index.php?option=c...w&id=4&Itemid=0</link>
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<description>
Aoccdrnig to a rscheearch at an Elingsh uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are,...
</description>
</item>
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<item rdf:about="http://fun.forum500.com/index.php?option=com_content&task=view&id=5&Itemid=0">
<dc:format>text/html</dc:format>
<dc:source>http://fun.forum500.com</dc:source>
<title>Mambo License Guidelines</title>
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<link>
http://fun.forum500.com/index.php?option=c...w&id=5&Itemid=0</link>
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<description>
Learn more about how Mambo is licensed and how this affects you. Mambo is released under the...
</description>
</item>
</rdf:RDF>