http://ooxmlisdefectivebydesign.blogspot.com/

Looks like he added lots more info. Only this post was available when I 
first saw that blog:

http://ooxmlisdefectivebydesign.blogspot.com/2007/08/microsoft-office-xml-formats-defective.html

...about how hard it is to do something as "simple" as changing a cell 
to have a constant value instead of a formula (a 5-second operation in 
Excel itself).

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