Books on Web services scalability

Question

Can anyone point me to some books on Web services scalability?

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EDIT

Thank you for your answers.

What I was looking for was a bit more specific. Basically scalability in an SOA architecture. I was able to find a couple of books that helped:

Web Service Contract Design and Versioning for SOA

Service-Oriented Architecture (SOA): Concepts, Technology, and Design (Thomas Erl)

Answer 1

There is a book called "Building Scalable Websites" from O'Reilly.

http://oreilly.com/catalog/9780596102357/

It gives you quite good introduction to many topics that are regarding scalability issues, but is rather narrowly oriented - PHP.

Answer 2

Scalable Internet Architectures is a very nice book for building scalable websites.