Here it is, PwnageTool 4.1 for Mac OS X, and it's good to go for Apple TV (2010), iPad 3.2.2, iPod touch (2010), iPod touch (2009), iPhone 4, iPhone 3GS, and iPhone 3G.
PwnageTool allows you to restore to a custom IPSW file. For instance, you can restore to a pre-jailbroken firmware while simultaneously maintaining your current baseband (and thus your ultrasn0w carrier unlock). You can also add whatever packages you want in the “Expert” mode of Pwnage
Apple TV is obviously a big addition here:
Welcome to the JB family! Right now, about all you can do is command-line stuff via ssh. You also have afc2 available, so you can use tools like ifunbox to move files around. These are the very early days of AppleTV 2G jailbreaking, so it’ll take some time for JB app developers to come up with methods to use your AppleTV 2G from the remote, versus the command line. PS: Your ssh password is “alpine”…please change it when you can :)
As always, proceed at your own risk, but if you try it out, let us know how it works for you.