Here's an interesting Rise of the Machines scenario: Gray Goo.
http://en.wikipedia.org/wiki/Gray_goo
You'd be some of the last people, or even living things, left on earth (perhaps because of an isolated location or a technological defense).
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War is the absence of reason. But then, life often demands unreasonable responses. -
Lucian Soulban, Warhammer 40000 series, Necromunda Book 6, Fleshworks
Entirely too much T2K stuff here:
www.pmulcahy.com