[fjtorres]

The business document management reader market is something of a white whale: many pursue it but nobody has come even close to harpooning it.
Yet.
Brother.
Bridgestone.
Delta.
Plastic Logic.
Ricoh.
All have tried but none have made any headway.

Lost in the hype is that corporate document management/viewing systems are generally in-house developments and airlifted turnkey systems. That went away in the 80's when PCs came in.
Regardless of the hardware tech, any successful corporate document management system needs to be compatible with the pre-existing server-side systems. Which means, mostly, SHAREPOINT. Failing that, it needs a full function browser and at that point you are describing more of a tablet than a reader.
There is a tremendous market waiting for a functional corporate reader system--the New iPad hardware is a good target for the client side--but without solid server compatibility with corporate IT systems, developing clients in a vacuum is just a quick road to oblivion.
It will likely take a few more years before we see a truly viable system.