My good friend and fellow SEMPO board member Kristjan Mar Hauksson has co-authored a book with the wonderful Anne Kennedy on the topic of global search engine marketing. I work at a company that is focused on enterprise global SEM as a core expertise, and found this book to be very helpful when navigating the complex landscape of international campaigns. I bought a stack of copies which will soon be distributed through our network (we operate in 4 continents).
Also worth a read is this review by Marshall Sponder over at SEW:
Here is a link to the book at Amazon, where you can read my additional comments in the reviews section:
The bottom line is that if you consider yourself a knowledgeable international internet marketer, this book is a must-have.