The Nexus One has a secondary microphone on the back that is used to detect ambient noises. This ambient sounds recorded here is then used to process the sound recorded by the primary microphone at the bottom and to produce a less noisy output for the listener at the other end of the call. CNET [...]
Interesting unbiased iPhone 3GS vs Nexus One comparison at ifixit.com
Nexus One’s multi-touch sensor (similar to the one used in HTC Dream/G1) has problems by design.
There is a video on YouTube that showed how the Nexus One loses 3G reception signal just by covering the back of the phone with a hand and it was reported on BGR. This may have led some people to think that it is due to the Nexus One being designed badly. taz5176 asked in a comment if this is the case for my Nexus One and I promised a video response and here it is.
Browse the full Android Market at http://www.cyrket.com/m/android/. Includes paid apps.
Have a read of what Tim O’Reilly, the CEO of the company that publishes many of the top computing books, thinks of the Nexus one at http://radar.oreilly.com/2010/01/the-nexus-one-vs-iphone.html.