That is a great site, thanks for sharing.
There is another website with a Kato-centric viewpoint that talks about recent copyright issues. This article is specific to whether you 'rent' or 'own' software. He specifically talks about how renting software is actually better, and is a very interesting viewpoint.
http://techliberation.com/2010/09/20/the-end-of-software-own...
Thanks for the compliment on the letter too.