How can I select the first element using XSLT?

I have a list of news items, sorted by dateCreated. I have a preview box control where I only want to show the first item. How can I do that using XSLT?

<xml>
    <news>
        <newsitem>
            <dateCreated>2009-09-09</dateCreated>
            <summary>Something great happened</sumamry>
        </newsitem>
        <newsitem>
            <dateCreated>2009-09-08</dateCreated>
            <summary>Something bad happened</sumamry>
        </newsitem>
        <newsitem>
            <dateCreated>2009-09-07</dateCreated>
            <summary>Something really bad happened</sumamry>
        </newsitem>
    </news>
</xml>