Please refer to Making of the Google Nexus-One for 1st part

Part 3 – Testing
This video is dedicated to testing environment of HTC and Google. Video included many test like tumble test, button test, drop test etc..

Part 4 – Manufacturing

Google has made a short file on making of Nexus One. Two parts out of five of this film are available to watch. I just finished watching first and second parts. I like the noise cancellation technology very much.

Part 1 – Concept & Design

Part 2 – Display and 3D framework

Latest information of Google Nexus One can be found at Google Nexus One YouTube channel.