I had never heard of cryonics until a friend brought it up yesterday and I was immediately interested in finding out more. Basically, "Cryonics is the preservation of legally dead humans or pets at very low temperature (below −200ºF, −130ºC — cryogenic temperatures) in the hope that future technology can restore them to life, youth and health." (from cryonics.org)
As of now, I probably would not do it. That website also says that "the repair capabilities of molecular biology and nanotechnology increasingly point to a future technology that can repair damage due to aging, disease and freezing." It doesn't sound too promising. Yes, if the technology of something like this can perfected and points to a future of certainty, then the things we can learn from preserving old bodies would be extremely beneficial.
But for now--just for fun--do you find cryonics to be impressive and ground-breaking? Or dangerous and pointless? And would you volunteer (okay you're not really "volunteering"--it costs something like $28,000)?