No... I think opening new windows should only be for external links. No exception I can think of.
Cause anyway, half the users dont know how to see the other window (bottom taskbar! Alt-Tab!) when they are maximized. If you dont believe me just sit for 10 minutes with anyone who has had a computer for less than 6 months and see...

Mateo Byler
<A HREF="http://crucedecaminos.com" target="_new">CruceDeCaminos.com</A>