crea un contador antes del foreach para que ese le cambie el nombre a tu input, algo asi:
Código PHP:
<?php
$xmlstr = file_get_contents( 'notas.xml' );
$content = new SimpleXMLElement( $xmlstr );
$c2 = $content->$featured->title[0];
echo '<table>';
echo '<tr>';
echo '<th>Codigo</th><th>Texto</th>
<th>Direccion</th><th>-</th>';
echo '</tr>';
$cont=1;
foreach( $content->featured as $featured ) {
echo '<tr>';
echo '<td><input type="text" name="nombre'.$cont.'" VALUE="' . $featured->title . '" size="10"></td>';
echo '<td>' . $featured->copy . '</td>';
echo '<td>' . $featured->image . '</td>';
echo '<td>' . $featured->link . '</td>';
echo '</tr>';
}
echo '</table>';
?>