Google’s first Android phone, Nexus One was released with Android 2.1 firmware. Today, Android Development Team has released the SDK (Software Development Kit) of this firmware for all the developers.
Android is comparatively new platform and it definitely lacks in quality mobile phone apps. By releasing the SDK, Android team has given great opportunity for developers to design some cool app for Android based phones.
Android 2.1 SDK release note on official blog -
Today, we are releasing the SDK component for Android 2.1, so that developers can take advantage of the new features introduced in Android 2.1. Please read the Android 2.1 release notes for more details. You can download the Android 2.1 component through the SDK Manager.
In addition to the new SDK, a new USB driver that supports Nexus One is also available today through the SDK Manager. The USB driver page contains more information.


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