Hardware Secrets posted a review on the T-Mobile G1 Smartphone

Google, which has become a powerhouse in the search category, has developed a new cell phone operating system called Android, and T-Mobile's G1 cell phone is the first piece of hardware that uses this new operating system. With both touch screen and built-in keyboard, the G1 is set to take on the Blackberry as well as the iPhone. Geeks everywhere love the G1 because the Android operating system is based on open-source code rather than proprietary operating systems like Microsoft's Windows Mobile or Apple's iPhone. That means that anybody can make changes to the operating system without consulting or paying Google. Also, for the most part, anyone can write applications that run on the G-1. So we set out to find out if this is just a cell phone for techies to love, or if it a serious competitor in the smart phone segment of the market.

T-Mobile G1 Smartphone Review