Pages tagged roles:

Micah Elliott: The Web Startup Surgeons
http://micahelliott.blogspot.com/2008/05/web-startup-surgeons.html
15 Roles Every Startup Needs Filled
http://www.businessinsider.com/15-roles-every-startup-needs-filled-2009-3
How to Add Simple Permissions into Your Simple App. Also, Thoughtbot Rules! // RailsTips by John Nunemaker
http://railstips.org/2009/4/20/how-to-add-simple-permissions-into-your-simple-app-also-thoughtbot-rules

I didn't realize the automatic boolean attributes part.
how to use mixins in Rails, with loads of useful stuff about testing at the end
Shoulda examples