Guys over xda-devs (notably, Booker-T) have rooted Google Nexus One. But, why to root with different method when we already have one? Well, the answer is actually connected to Bootloader. You need to manually unlock the bootloader of Nexus One android allowing you to install custom software, ROM for testing and development. But, after unlocking Nexus One bootloader, an unlocked icon appears on the screen (after reboot) making your warranty claims void. But the method devised by Booker-T roots your Nexus One without unlocking bootloader.

Steps to Root Nexus One Android without unlocking Bootloader
Currently, the steps for rooting nexus one has not been published, but stay tuned we will be posting step by step tutorial on how to root nexus one, install custom ROM without unlocking bootloader.
via - xda-devs
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