The app's premise is simple: allow consumers to use one keyboard in portrait mode and another when they turn their phone on its side. Execution is good too, as evidenced by all the positive feedback in the Market.
Indeed, just about the only caveat is that several users have reported installation issues on the ATRIX - follow these instructions should you experience such problems.
As always, the QR code and the Market/AppBrain links follow.
Keyboard Manager (root users)