Wish I could shed some light on the matter! I have been wondering the same thing. I was (am?) a pretty active member there, but it's been nearly two weeks. I dropped a note to the moderator, but have not heard back. I'm not sure what happened, but the moderator (and, I assume, site owner) has a history of hot or cold involvement with the site. Recently he was seeking sponsors and contributors, both financial and content-wise, so I was hopeful the site might get back up and running. But now....?
I miss PalmOnMac. It was nice to be able to discuss the Mac side of the PalmOS equation with other Mac users.