.@Kellblog has some other really good stuff on his blog, too, like http://kellblog.com/2008/02/14/how-to-develop-a-marketing-message/ … His "best of" list: http://kellblog.com/best-of-kellblog/ …
"Perpetual Money vs. Perpetual License: Subscription, SaaS, and Perpetual Business Models" http://kellblog.com/2011/01/26/perpetual-money-vs-perpetual-license-subscription-saas-and-perpetual-business-models/ …
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