Not that it'll compete with a dedicated UV app, but 3D-Coat has always done a very good job with UVs for me. Andrew has just released a new beta with "Globally Ungorm Unfolding" in addition to the other methods: http://3d-coat.com/forum/index.php?showtopic=10395&hl=
It has a Softimage AppLink so you can send models back and forth very easily. -Paul ᐧ
