Just downloaded this and managed in under ten minutes what took me three hours without this fantastic plug-in.
If you use Photoshop and have to mask complex stuff, you’ll know what this if for - download it and see what you think.
http://rapidshare.com/files/8484124/mask_pro.rar
Password: worldsdown.com
Has excellent on-board tutorials, incidentally.
Details at: http://www.ononesoftware.com/detail.php?prodLine_id=4