I voted Omura, but only cause he's at the top of your list.
![Smiley :)](http://www.theswamp.org/Smileys/black/smiley.gif)
I have no experience with any of these authors, except to say that I've heard a lot of good stuff about George and Ellen both.
IMO, the single biggest things are the
CUI philosophy which Robert Bell does a real nice job explaining in the augi forums.
Dynamic blocks are the other biggie. I've learned LOTS from many of last years AU handouts (Matt Murphy's are pretty thorough)
^^both freebies.
![cool 8-)](http://www.theswamp.org/Smileys/black/cool.gif)
there's always THIS place.
(hows that for not answering the question?)