Guide: Root Google Nexus S

The Google Nexus S has been rooted by developers over at XDA-Developers within the first hours of release. You can expect a good amount of custom ROM development for this device, and some awesome hacks and modifications.

If you want to root your Google Nexus S, simply follow the easy instructions below:

Instructions

1. Reboot into fastboot mode
   • Power off the device, Press and hold Volume Up/Down and Power
   • Or, in ADB: adb reboot bootloader
2. Install this recovery
   • fastboot flash recovery recovery-clockwork-herring.img
3. Boot into Clockwork Mod recovery mode
   1. In ADB: adb reboot recovery
   2. In fastboot: choose recovery mode
4. Flash the latest Superuser
5. Congratulations! You have root access! If you’re having problems, click that source link and post in the forums!

Source: XDA-Developers