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Re:Disqus: Scaling the World’s Largest Django Application by buro9 on Tuesday February 22, 2011 @11:02AM (#2250238)
Both of John Allspaw's books (the latter two on your list) look good from their table of contents.

And if you're in doubt, John is now VP of Ops at Etsy and came from Flickr before that: http://www.kitchensoap.com/about-me/

His blog is interesting too: http://www.kitchensoap.com/

So without having read the books, I would shoot for the latter 2 if I wanted to have hard copies around to introduce me to this kind of stuff.

Re:Disqus: Scaling the World’s Largest Django Application by ruckusing on Wednesday February 23, 2011 @02:30PM (#2255399)
I've found "Scalable Internet Architetures" by Theo Schlossnagle to also be quite valuable. It contains general advice on how to approach problem solving when it comes to building uh, scalable architectures.

http://www.amazon.com/Scalable-Internet-Architectures-Theo-S...