Howard, Neale E. : Standard Handbook for Telescope Making
This book walks you, step-by-step, through the making of an 8" f/7 telescope (Howard's 'Standard Telescope'). It was my tutor for my first telescope, and is a very good tutor at that!
Manly, Peter L.: Unusual Telescopes
Full of interesting and amusing ideas. Not a manual, but more a general interest book for armchair ATMing.
Moore, Patrick (ed): Small Astronomical Observatories
A number of different observatories, including radio, built by amateurs around the world.
Strong, John: Procedures in Applied Optics
Design and Construction of optical instruments. Extremely good book.
Texereau, Jean: How to Make a Telescope
This book is the most complete single work available on making reflecting telescopes. The 2nd Edition has the original's chapters on making Newtonian telexcopes plus additional chapters on Cassegrainian telescopes, optical windows, and equatorial mounts. Chapters on eyepieces and astronomical seeing have been expanded.
Tonkin, Stephen (ed): Amateur Telescope Making
This is one of the few telescope-making books that is still in print and is a useful addition to any telescope maker's bookshelf and a complement to the other modern ATM books. There are fifteen projects for the ATM, including mounts, astrophotography and electronics as well as telescopes of varying complexity. This does not cover basic work; use Texereau or Howard for that.