Some beginner Flex 4 samples were pushed to Tour de Flex today. These were all written by our the Flex SDK QA team. They should help you get started with Flex 4 now that the public beta has been released. There should be a sample for all of the Spark components, effects, 3D layout, Advanced CSS and the various FXG (graphic primitive) classes.
If you don’t have the Tour de Flex application yet, you can download it here:
If you do have Tour de Flex, the samples should get pushed down to you automatically. Look for the “Flex 4 Preview” section.