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Thanks for posting this. How does this pan out with the recently updated billing policy changes?
@hrj -- I was actually planning to update the blog post next week to answer that question (notice that the post was written in 2009.). Basically, the free GAE lunch is over since under the new billing model "Paid apps cost a minimum of $2.10/week..." (http://code.google.com/appengine/docs/billing.html#Enabling_Paid_Apps).