The scientist's open letter on cryonics, signed by people such as Gregory Stock, Stanley Shostak, Ralph Merkle, Eric Drexler, Aubrey de Grey, Gregory Benford, and a range of researchers in the life sciences you're probably less familiar with, but who are household names in their fields.

http://evidencebasedcryonics.org/scientists-open-letter-on-c...

A layman's introduction to cryonics:

http://www.fightaging.org/archives/2001/11/cryonics.php

Lots of deeper technical details can be found at Alcor (which maintains a better web presence than the Cryonics Institute):

http://www.alcor.org/sciencefaq.htm

The basic process is pretty similar between all modern cryonics organizations. Important to note is that freezing is out, vitrification is in. That makes a large difference to cellular structural integrity. See:

http://www.benbest.com/cryonics/vitrify.html