In its portrait mode the joy stick is at the bottom. It is just as easy to operate one-handed this way as the TungstenE I also used to own. If you are accustomed using the hardware buttons on the bottom of the TE, it may take some getting used to. When I read like this I use the joystick or the on-screen controls.

The default view is landscape. Although its OK to hold it one-handed this way (as long as you support the whole unit in your palm), it is designed so naturally for two hands that I always seem to hold it that way. It feels good.

I can't answer your question about the signature with any authority, however, as I understand it that in order to utilize the special features of the Zodiac (eg video chip), the software must be signed (approved?) by Tapwave. It would then be able to fully utilize the Zodiac's extra performance.

For example, from your previous posts I see that you are fond of exotic fonts. The new Fontsmoother program is not compatible with the Z because it needs YAHM. Apparently YAHM won't work until it is signed.

The Tapwave "soft" case comes with an relatively hard insert. This in addition to the leather screen flap and aluminum body gives it enough protection that I have no concern about screen safety.

Hope this helps.