Excellent layout of the real problem: the control mechanism, rather than the creation of AI itself.
I started this Reddit on Ethereum where AI may be recreated first:
http://www.reddit.com/r/ethereum/comments/3430pz/an_ethereum_enabled_possibility_what_happens_when/
http://www.ted.com/talks/nick_bostrom_what_happens_when_our_computers_get_smarter_than_we_are
I realize this might go into a post in a media thread, rather than its own topic, but it seems big enough, and likely-to-prompt-discussion enough, to have its own thread.
I liked the talk, although it was less polished than TED talks often are. What was missing I think was any indication of how to solve the problem. He could be seen as just an ivory tower philosopher speculating on something that might be a problem one day, because apart from mentioning in the beginning that he works with mathematicians and IT guys, he really does not give an impression that this problem is already being actively worked on.