http://raghuonflex.wordpress.com/tutorials/beginner-tutorials/

http://sujitreddyg.wordpress.com/tag/flex-tutorials/

http://www.cartoonsmart.com/flex_intro.html

http://www.webappsolution.com/wordpress/2009/05/01/flex-spring-actionscript-cairngorm-tomact-blazeds-spring-hibernate-mysql-pt1/

http://blog.stroep.nl/2008/08/flex-tutorial-build-a-calculator/    

With Flex you can create applications. So, why not start creating a very simple application, like a calculator?

http://franto.com/how-to-skin-a-flex-video-player-tutorial-from-dolores-joya/

Learn Flex in a week by going through this video training course. To maximize your learning, we recommend that you view the videos and complete the exercises in the order in which they are listed

http://www.adobe.com/devnet/flex/videotraining/

Learn to use Adobe Flex 4 beta 2 and Adobe Flash Builder 4 beta 2 in a week by stepping through this video training course.

To get started, follow these steps:

1. Download and install Flash Builder 4 beta 2 (requires free Adobe membership).Note: You must have Flash Builder 4 beta 2 installed for this training. If you are working with Flash Builder 4 beta 1, you may not be able to complete the exercises.
2. Download the project files for each training day.The project files include the starter and solution files for the listed exercises as well as transcripts of the training videos.

   Note: If you prefer, you can also download the starter and solution files for each exercise individually from the respective exercise pages.

3. To maximize your learning, view the videos and complete the exercises in the order listed.

http://www.adobe.com/devnet/flex/videotraining/flex4beta/

Flex Best Practices

http://www.jamesward.com/2008/07/22/video-flex-best-practices/