it's unrealistic to expect an *idea* with no marketing resources behind it to "threaten" a product that is supported by a base of several million devoted customers and an enormous marketing and distribution program :-/
Update: It works! I built the one-transistor amplifier on this page to boost the mic output up to line level for my Mac mini:
http://www.diylive.net/index.php/2005/12/19/ten-most-needed-circuits-for-the-diyer/
From the page: "eliminate cross conduction by forming back-to-back diodes with the body diodes of the MOSFETs".
I wonder if this technique has applications in class b or d audio amplifier design...