I like the Goldberger books, lots of very nice pictures of very seldom seen watches. Some information about movements and references although nothing really in depth.
They are more a coffee table book than a reference work, but I rate them highly due to quality and quantity of the images together with their affordability.
Here's a link to the review of the book about Longines
And here's the complete online copy of one of the two Omega editions, this one Omega Sports Watches
http://issuu.com/teko/docs/omega_sportwatchesClick to expand...