Since Nexus One is still new, there is no “one click root” available for it yet, but I’m sure the team behind Flash Rec will release it soon. Their app for Hero really saves a lot of trouble when rooting it.
In this tutorial on how to install and root your Nexus One using RA Nexus Recovery Image, I’ll use the fastboot method as given by Amon himself.
How to Install RA Recovery Image on Nexus One
Just follow the steps below to install the RA Recovery Image on your Nexus One.
Remember: You should have an unlocked bootloader to install the RA Nexus Recovery on your phone. [...]