I just finished reading through McNally's book (Hot Shoe Diaries), again, and it is awesome. Even better the second time through. Tons of great lighting advice in there. I highly recommend it.
This one: http://amzn.to/K6eAQZ
McNally has a real down to earth style about how he sets up his scenes and just makes it work, very very well, with what he has - which is small light in this book.
Great stuff, especially with the new 600EX-RT (http://amzn.to/I616Ey