Pues asi a pelo podrias usar algo asi:
Código PHP:
$doc = new DOMDocument();
$doc->loadXML("http://twitter.com/statuses/user_timeline.xml?screen_name=$User&count=$Twits");
$Twetts = $doc->getElementsByTagName( "status" );
foreach( $Twetts as $Twett ):
$Twtter = $book->getElementsByTagName( "text" );
$Twtter = $Twtter->item(0)->nodeValue;
echo $Twtter."<br>";
endforeach;