Here's a 40 minute video from the Alcor Conference in 2006 giving a nice, straight-to-the-point overview of the process (and current state-of-the-art) of cryopreservation. It also explains the reasons why cryonics is thought to be a reasonable means of reaching the far future.

Alcor Conference 2006 - Brian Wowk, Ph.D. - The Cryobiological Basis of Cryonics (42 min) from Alcor Life Extension Foundation on Vimeo.