I suspect that cryonics won't catch on in the atheist/skeptic/humanist community, if ever, until enough people with status in it think they invented it.
Currently these fellows view cryonics as an assault on the common sense and moral intuitions about death we absorb at an uncritical stage in our cognitive development, along with religious doctrines which tend to reinforce them. (See the New England Primer for a famous historical example.) To them we say something which sounds like, "Xerxes the Great did die,/But cryonicists say not I."
We still have Larry King in the queue, possibly. I encourage him to follow through on his plans for cryotransport, despite the fact that for a celebrity, a lot of people apparently don't like him.
While I think that cryonics in principle could make sense, and I don't share the intuitive problems with it, in practice I belief that the changes to be resurrected in a sort-of continued existence is very, very small. In terms of life expectancy, resources spent in other ways seem to have a higher utility.
Now, I may very well be wrong (I'm certainly no expert on the latest in cryonics research), but do you think there is any realistic chance for cryonic success, given the technology of, say, the next twenty years?
Having been diagnosed with cancer last year, writer Christopher Hitchens has died. He was known as as an outspoken atheist, which is not, in itself, identical to being a committed rationalist in any systematic way. Even so, he seemed to have the virtue of moral courage, the willingness to speak the truth as he saw it, without fear.