With the release of the Galaxy Nexus today so are the instructions to unlock it’s bootloader. You don’t need to hack the bootloader to unlock it all you have to do is follow some rather simple instructions. The method below requires a Windows based PC and the Android SDK but should prove to be easy for almost anyone.
Make sure that the AdbWinApi.dll file is also in the Tools Directory
At this point adb.exe, fastboot.exe and AdbWinApi.dll should be in the same folder
Turn on USB debugging on your Galaxy Nexus
Plug your device into the PC via USB
Navigate to your SDK/Tools folder on your PC
Hold Shift and Right Click “Open command window here”
In the command window type “adb reboot bootloader” press enter
Wait for the device to reboot into the bootloader
Type “fastboot oem unlock” press enter
Use the volume keys to select yes and power button to select
The bootloader is now unlocked and will reboot
After unlocking the bootloader you have full control over your Galaxy Nexus. You will also still get OTA (over the air” updates with the bootloader unlocked so no worries there. Please let us know if you have any questions or run into any issues along the way.