Richard Barton of Zillow Jack Dangermond of ESRI Also would like to see a gaming founder - Carmack is a fine candidate & -Jason Rubin & Andy Gavin formerly of Naughty Dog & currently with/founded Flektor
George Broussard and the Duke Nukem team would be great, too (the brilliant guy who wrote the then-ubercool 3D game engine was still a kid at the time!)
By the way: web startups are great but they aren't the only ones. "Founders at work" is a great, great resource but it would have been even greater if it focused a little less on web stuff.
A very brilliant guy is Matt Dillon. Not the actor... well, he certainly is brilliant too ;) The software developer: http://en.wikipedia.org/wiki/Matt_Dillon_(computer_scientist)
He started a few startups but he is mostly known as a BSD kernel developer wizard. He started the very innovative DragonflyBSD project (a fork of FreeBSD with impressive goals).
Chuck Moore (inventor of Forth and computer visionary) started/was part of a few startups, too. Lately, he has been with IntellaSys creating an impressive, radically-different microprocessor ("SEAforth").
The story of Bill Joy (BSD, TCP/IP hacker and co-founder of Sun Microsystems) would be cool, too.
The Lisp Machine guys would be great as well (though there already is some info available of the net).
And why not founders in fields not related at all with computers? The founders of Bose, Hobie Cat, etc.
EDIT: yes, there is a lot of superlatives :)