Galaxy Nexus one click root methd, unlocks bootloader and installs ClockworkMod.

Better yet, it was just updated to version 3.0, which does all of the aforementioned steps with one click – so, even if you’re not familiar with all that stuff but are willing to take the risk of voiding your warranty, you can now go ahead and enjoy all the custom ROM goodness the Galaxy Nexus has to offer. Should you change your mind, it also allows you to relock the bootloader and reflash the stock recovery.
Sounds good enough? Visit the forum thread, which also provides detailed tutorials and lots of FAQs to help you get started.Thanks to all the brilliant devs over at XDA!