It came out on August 4th. I just discovered it when I opened TTP and, on a whim, pulled down "Search for Update" from the menu.
They should be coming out with 5 shortly.
they have a couple of neato programs now for those with iphones and ipods. one is called Syphone, it sycs iphone messages and the other is Protogo? that turns an ipod into a service device for your mac.
I think an upgrade to 5 will cost folks who have 4.6,unless you buy now.
The application saved my bacon once, when all others failed, so to me the expense is worth it. DiskWarrior may be the favorite but it couldn't help me out of my jam. It's been years now so i can't remember the details but my iBook was a door stop for a while.