A Basic Introduction To Cryonics: The Cryonic's Institute's Introduction to Cryonics. 11 printed pages.
Cryonic Suspension: By Henry Kluytmans, a Dutch cryonicist. 5 printed pages.
Cryonics Intro -- A Simple Proposition: Trans Time's Introduction to Cryonics. 3 printed pages.
Cryonics: The Issues: An introduction by Canadian Ben Best, 8 printed pages.
Nanotechnology and Cryonics: An introduction by Jerry Emanuelson of Colorado Futurescience. 3 printed pages.
Ralph Merkle's Cryonics Introduction: Short and useful, but not really "simple." It assumes some knowledge of cryonics already, so read some others first. 3 printed pages, with several internal hyperlinks to other explanations or web pages.
The Cryonics Thesis: The why of cryonics, as understood by the Cryonics Institute.