Portland Frame Builder with new book
Robobike is a little known shop in Sellwood that builds a lot of different kinds of bikes but not the variety usually associated with custom frames. I first ran into their stuff in Australia where you can buy a recumbent kit to assemble at home. The book is "How Much Does It Weigh?" and is at Powells technical book store last I checked.
I've read it and even though I have no intention building bikes, it is a good read and a good insight on how bikes are designed, particularly working bikes.