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anon85 comments on MIT Technology Review - Michael Hendricks opinion on Cryonics - Less Wrong Discussion
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Just an enthusiastic amateur who's done a lot of reading. If you're interested in hearing a more informed version of the pro-cryonics argument (and seeing some of the data) I recommend the following links:
On ischemic damage and the no-reflow phenomenon: http://www.benbest.com/cryonics/ischemia.html
Alcor's research on how much data is preserved by their methods: http://www.alcor.org/Library/html/braincryopreservation1.html http://www.alcor.org/Library/html/newtechnology.html http://www.alcor.org/Library/html/CryopreservationAndFracturing.html
Yudkowsky's counter-argument to the philosophical issue of copies vs. "really you": http://lesswrong.com/lw/r9/quantum_mechanics_and_personal_identity/
You might be interested in Aaronson's proposed theory for why it might be physically impossible to copy a human brain. He outlined it in "The Ghost in the Quantum Turing Machine": http://arxiv.org/abs/1306.0159
In that essay he discusses a falsifiable theory of the brain that, if true, would mean brain states are un-copyable. So Yudkowsky's counter-argument may be a little too strong: it is indeed consistent with modern physics for brain simulation to be impossible.