oohh... hang on a moment: It seems that KindleGen is a not so tolerant of whitespace in the XHTML as MobiGen!
Code:
<link rel='StyleSheet' type='text/css' href='StyleSheet.css' />
works on MobiGen and KindleGen...
Code:
<link rel='StyleSheet' type='text / css' href='StyleSheet.css' />
KILLS all your CSS in KindleGen by dropping the stylesheet! But works on MobiGen
Holding off on all my flames until I get stuck again!