I wonder if there is anything else that might conceivably be used to input commands. I am sure there must be some imaginative possibilities!
closed as off topic by hexafraction, Takkat, devav2, Jorge Castro, Rafał Cieślak Oct 6 '12 at 19:56
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I have done a small research based on your interesting question, assuming to find nothing, but I have met these:
These are funny devices for entering text like playing a piano, you use one or more keys together to enter characters. The first one has been designed for so called wearable computing.
Don't know if you're seriously looking for a replacement for keyboard, but if you're just curious you may read this : http://dl.acm.org/citation.cfm?id=54675.54695 . It looks like some large document on input.
Also voice recognition is an option, but for bios, not this decade I guess :)