When hacking a device, one of the first things to consider is how it can be flashed back to stock in case something bad may happen, such as a brick. This consideration is just as important to users as it is to developers. Unfortunately, official stock images are rarely ever released due to licensing and other various reasons. Sometimes the community is lucky enough to get a "leak" of these images which is even more rare. Because of this I have taken it upon myself to make my own factory images from source. These images can be flashed via fastboot either by the "update" command or by flashing each .img individually.
I put in quite a bit of work to make these images match exactly what shipped on the retail Galaxy Nexus (Maguro). The build.prop is identical, the boot.img is secure, no applications or files are missing, etc. This is as close to the real deal as it gets. Once again I will mention, so I do not get a C&D from Samsung, I made these myself, they are not a leak of official files. When the Verizon version of the Galaxy Nexus (Toro) becomes available, and its associated source is released, I will make images for it as well.
As stated earlier, quite a bit of work went into making these. If you would like to post these on other websites or forums please link to this post, and only use my bit.ly download links so I can keep track of the statistics. If these ever save you from the nightmare of sending your device back to Samsung for flashing or replacement; a donation, thank you comment, or a Like, would be a sure way of showing your appreciation.
Official support for these images can be found at RootzWiki where I have created a thread to discuss.
The download link for these images as well as other files such as stock ROMs can be found at: download.peteralfonso.com/maguro (you can +1 this page to share with friends!)