Here's something unusual and of interest to any custom OS users out there -- Google has made available a full, clean, original factory image for the Galaxy Nexus. It's a total reset and reinstall for the convenience of modding fans.
As well as all the files needed to flash a European GSM Galaxy Nexus back to its factory state, Google's included an automated script to make it even easier -- although you'll still need a sound knowledge of bootloader management and ROM installation in order to make it work.
In case you're not into the modding scene, this isn't the same as doing a factory reset on the phone itself. This is for people who've been fiddling with and changing the actual OS files. It's also quite an unusual step, as this sort of thing is usually left for members of the modding community to sort out themselves. [Google via Android Community]