Vanilla is a product of Lussumo:
Documentation and Support.
Gray Goo won't be a problem, the reason behind this is that we can visualise it and therefore protect against it.
If we ever get to the point where script kiddies can release dangerous gray goo, we're probably doomed—since it'll surely be harder to stop goo than to stop slow-moving, slow-thinking meat robots from pushing the wrong buttons.
Haha. The Center for Responsible Nanotechnology thinks that while robotic issues would be more likely to pop up first, if we do reach a certain level of goo technology then we've got problems:
I have some insurgent made Juba sniper vids and it is very dramatic and effective.
The Audio Spotlight is a revolutionary new audio technology that creates sound in a narrow beam, just like light. Aim the flat, thin speaker disc to your desired listening area, and provide all of the sound — with none of the noise.
The trick is to ensure the killers evolve at the same rate as, or faster than, the goo.