@jtt - the hardware launches were The Panel, Quantum Film, Glide TV and Phone Halo (so 4/20)... there were a lot more mobile apps and Web services than new hardware, perhaps because hardware is still more expensive to develop on a startup budget. A new battery technology means a lot of investment in chemistry which is harder than physics to industrialize and reproduce reliably, but it's an area I keep tracking!
@climber - the signature gets embedded into the document that's sent, just like any fax; today a lot of people print out, sign and then scan forms to email. Zosh actually saves the mathematical vectors of your writing so it could prove you signed something (or didn't). The Zosh team did ask me if I'd be prepared to save my signature online to use with devices that don't have a touchscreen and I said 'depends on who secures the site' but there are huge potential security risks in doing that and it's not what the app does today.
@JohnnyLucky - I expect to save a lot of money with the Rebtel app!