As I put more and more pressure on myself to finally start with Flex, my useful bookmarks collection of blogs is getting bigger. There isn't better way of learning things than learning from the source, and in this case that source+ is Peter deHaan's Flex Examples blog, who works for Adobe on the Flex SDK QA team.
Blog is updated more than daily and every post is new Flex lesson with source code. I will mention just few recent post titles:- Styling the HSlider control using CSS (12. sept)
- Customing the Flex HSlider and VSlider controls (11. sept)
- Changing the cursor in a flex application using cursormanager class (10. sept)
- Styling the titlewindow container (10. sept)
and many, many more...