1) What is the difference between adobe flex builder 3 and adobe sdk 3.0
I have heard that flex builder 3 is commercial and adobe sdk is freely downloadable. I would like to know the steps to start learning and writing a simple program using adobe sdk 3.0. Please help me.
2) which book or site can I refer to start learning adobe flex quickly.
Please guide me as I am unable to start learning on my own currently.