Where to start for SOA

Which book for SOA?  I tried many books to start with, after reading couple of chapters I realize that its not what I am looking for.  I kept dummies book at last and now realize that its good to start with.

So I have settled with SOA for Dummies.  Its going good so far.  Its really nice from little history about computing, internet and it drills down to SOA and how it emerged and why it came into existence and how its helping to overcome challenges from earlier systems.  Nothing technical. I am planning to put my notes here, so it can save your some time.