In reaching out to learn Scrum - I came across and joined the LinkedIn group called Scrum Practitioners. After a few hours, I've decided that this group belongs on our Scum Resources list (Find the updated list below).
The Scrum Guide: The Definitive Guide to Scrum - The Rules of the game
Note that the Scrum Guide is revised as of July 2011 - this link is to the current version
Video: Learn SCRUM in Under 10 Minutes
Scrum Practitioner's Group at LinkedIn