http://www.notifymail.com/palm/#treotoolsfortreo600 is the site. Funny, I transfered mine over from my 180, but there's a 600 version. So far I haven't had any problems with the old version.
It's a simple little program that turns the phone off and on at teh time you choose. I wish all cell phones had this option
It does sound like you'll need to contact Palm about the ghost in your Treo, though.