Books : Also a full comprehensive flex book collection

Flex 3.0 : Training from the Source

This book is what really made me go through all the different things Adobe Flex can do. This is practical working book that is project oriented.

Learning Actionscipt 3.0

This is a fantastic book written by Rich Shupe. This teaches Actionscript 3.0 from a beginner standpoint. Even if you know Actionscript 2.0, this is a nice transition to 3.0

Online Resources

• Adobe Tour De Flex
  

  Tour De Flex is an Adobe Air application that runs on your desktop. Tour de Flex is a desktop application for exploring Flex capabilities and resources, including the core Flex components, Adobe AIR, data integration, and a variety of third-party components, effects, skins, and more. This is a very handy tool to see all the MXML components in one place and view the source code.

• Flex Cookbook Beta
  

  Great site

• Flex.org
  

  Flex.org aggregates Flex news from a number of sources, and allows community members to contribute their own content as well.

http://blog.flexexamples.com/
• Flex.org
  

  Flex.org aggregates Flex news from a number of sources, and allows community members to contribute their own content as well.