I've created a tutorial on drag and drop in Flex.
It includes a PDF for the tutorial with full code for 13 simple example apps, a link to download the entire Flex project with the 13 example apps, and links to the 13 apps online, for which you can right-click and select View Source if desired.
Next I will create a tutorial on advanced drag and drop in Flex. Enjoy.
Replying just so more people can see the post on this tutorial.