You know, someone could probably build the app to do this in C, targeting Linux as the OS, using serial as the interface, and it would probably run on gobs of hardware that's already out there for nearly free. People could root their old 2nd generation iPod or whatever, and use it as a transaction verifier and be able to get into it for zero hardware cost (or pick one up on eBay).
Sure, but that's a nerd thing.
We are targeting grandma's here.
Not exactly. The goal isn't to make it a hobby project for nerds, the goal is to get the hardware cheap. There is SO MUCH obsolete hardware that could run an application like this that people are throwing in the garbage. It would be a sustainable business model to pick some old gadget, refurbish and recycle it into a low-cost bitcoin transaction verifier, and sell it on the open market to grandma. An iPod modified to be a transaction verifier would be very grandma-friendly (if someone else does the modification, of course).
Would you trust your bank if the gave you a secondhand device, that they had reconfigured? Would you trust me if I gave you one?
Here, safewallet for you my friend, only 2,5 Btc
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)
To get to grandma and avarage joe, it has to be something that is comes in a plastic package and can be bought in stores.