How To Root Google Nexus One

Your Nexus One is a developer model, and doesn;t need to be rooted. Instead we can unlock the bootloader and flash any firmware we want on the phone. Methods that try to circumvent this in order to cheat HTC (because YOU voided your warranty) aren't going to be discussed.Disclaimer: Rooting voids your warranty (however you can unroot your device any time) and can potentially brick your device if you fail to follow the instructions carefully. Follow this guide at your own risk. 

You'll need the Android SDK installed. Follow Google's directions, and sing out if you need any help.

You'll also need Fastboot. Get it for your platform from HTC right here. Place the fastboot application in your SDK/platform-tools folder.

If you use Windows or a Mac, download and install PDAnet to your PC right here. This makes sure you have a USB driver that works in fastboot, and is the easiest way to do it.

Enable USB debugging on your phone (menu>settings>applications>development).

Next, power off your phone and hook it up to your computer. Hold the trackball, and press power to boot into fastboot mode.

Once your phone powers up, open a command prompt and navigate to your SDK/platform-tools folder. At the prompt type

Code:

fastboot oem unlock

Choose YES to unlock your phone and void your warranty, and you're done.. At this point you can install a custom recovery and/or a custom ROM with root enabled.

Enjoy Android the way it was intended !!