I also found Coding Badly's write up on how to tune an attiny and I'm reading through it
This?
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1287558192
For now, this is the documentation for the Google Code link I posted earlier...
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1285218245