Guy Kawasaki has some interesting things to say - and the experience to back it. Must be the Pacific sea breezes that create this type of thinking with Guy and Robert.
See his blog here: http://blog.guykawasaki.com/2005/12/to_build_a_case.html

See an article on Guy thoughts on innovation here:
http://www.webpronews.com/insiderreports/searchinsider/wpn-49-20061114PubCon10TipsforSuccessfulInnovation.html#more

Business Model Design and Innovation: What is a business model?