it would be
<a href=href="http://www.tutorial-writers-inc.com"target="_blank">Tutorial Writers Inc.</a>
That wont pass xhtml 1.0 but will work. If you want to pass xhtml1.0 standard do it like this
<a href="http://www.tutorial-writers-inc.com"onclick="target='newwindow'">Tutorial Writers Inc.</a>
did you know that Dave?