Custom Magento admin notification, example RSS feed

feed.rss

<?xml version="1.0" encoding="utf-8" ?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
    <channel>
        <atom:link href="http://www.magentocommerce.com/notifications_feed" rel="self" type="application/rss+xml" />
        <title>MagentoCommerce</title>
        <link>http://www.magentocommerc.com/</link>
        <description>MagentoCommerce</description>
        <copyright>Copyright (c) 2009 Varien</copyright>
        <webMaster>support@varien.com (Magento support)</webMaster>
        <language>en</language>
        <lastBuildDate>Thu May 14 12:00:01 2009</lastBuildDate>
        <ttl>300</ttl>
        <item>
            <title>Magento version 1.3.1 now available</title>
            <link>http://www.magentocommerce.com/blog/comments/magento-version-131-now-available/</link>
            <severity>3</severity>
            <description><![CDATA[Magento version 1.3.1 is now available for download and upgrade. This version includes some issue resolutions for Magento version 1.3.x and new features such as Checkout By Amazon and Amazon Flexible Payment. To see a full list of updates please check the release notes page.]]></description>
            <pubDate>Sat Apr 18 04:06:02 2009</pubDate>
        </item>
    </channel>
</rss>