Session recording: http://experts.na3.acrobat.com/p21769918/

Architectural Overview:http://opensource.adobe.com/wiki/display/osmf/Strobe+Architectural+Overview

Intro to Traits (PDF):http://opensource.adobe.com/wiki/download/attachments/34373769/traits+intro.pdf? version=1

Features & Roadmap: http://opensource.adobe.com/wiki/display/osmf/Features

Specifications: http://opensource.adobe.com/wiki/display/osmf/Specifications

Building a HelloWorld app with OSMF:http://blogs.adobe.com/osmf/2009/09/building_a_helloworld_app_with_osmf.html

Intro to OSMF (video from MAX session):http://2009.max.adobe.com/online/session/332

Technical Intro to OSMF:http://blogs.adobe.com/osmf/2009/08/technical_intro_to_osmf.html

Intro to OSMF (by Jodie O'Rourke): http://jodieorourke.com/view.php?id=111&blog=news

If you'd rather see running code, the most succinct app for seeing what OSMF can do is the ExamplePlayer  (source is here).  It shows a wide variety of examples, each of which is represented by the exact same base class (MediaElement), which is what allows the player code to be decoupled from the various media implementations.

Spec:

http://opensource.adobe.com/wiki/display/osmf/Specifications