Where they come from: http://sethgodin.typepad.com/seths_blog/2010/11/where-do-ide...
Why spread?: http://sethgodin.typepad.com/seths_blog/2010/10/ideas-spread...
999 ideas from his 'MBA' program: http://www.sixmonthmba.com/2009/02/999ideas.html
Execution > Ideas - start spreading!