Author and Interactive designer Will Goldstone has recently completed his raw book – essentially an eBook on developing professional quality games in the increasingly popular Unity game engine. According to Will, this book is great companion for beginners to the engine; hence Essentials in the title. The physical book will be made available at a later date. [Read more info]
Updated Oct 6th, 2009 – Hard Copy edition is now available for purchase
Will Goldstone
Unity Game Engine
Tito A. Belgrave is currently employed as a 3D artist at Bedlam Games in Toronto, Canada. He's also an avid freelance game journalist. 
I’m very pleased with the early release, ESPECIALLY in the fast paced industry where many books are obsolete before they are published making them worthless….. I will only purchase (Read as We Write ebooks).
Well I can sorta agree with you there, I do like physical books at times since reading .pdfs can do a hellish thing on the eyes in the wee hours in the morning, but on the other hand I love the portability of .pdfs and the fact they don’t make me as sleepy while reading
Published book is available now!
http://www.packtpub.com/unity-game-development-essentials/