OK I have checked out **every** suggestion in this thread, and so far it seems mediacoder is by far the winner. TMPGenc seems great, if only it supported some decent formats ... too bad it doesn't. same deal with handbrake. super is slow as crap.
mediacoder is very fast and supports just about every format, but I have run into a few random glitches, files randomly decide they don't want to get transcoded, and one time a transcode finished but the sound was all glitchy. I don't know if I should blame this on the x64 version that I am trying out, plus, I'm not convinced it's truely x64 because vista task manager lists some of the heavy CPU usage plugins with a *32 .
So far, though... I really don't see a better program than mediacoder, unless you have some very specific authoring to do in which case tmpgenc should be good......