Learning AS3... curious about Flex..

Good morning..
I've been working pretty hard the  last few months learning AS3..  I am starting to fell pretty competent  with AS3 and am enjoying working with it.
I am now looking to implement a program that can be run through a Flex API.
How is Flex different than AS3?
Can anyone suggest some good starting steps to familiarize myself with Flex and start learning?
What is mxml and do i need to learn it for Flex?
thanks in advance,
J

I am newly introduced to flex as well and had to "try" to get famailar with it very quickly.
some good resources were learn flex in a week video training located here and also try lynda.com. I have not had to build anything in flex yet, but I had to have a good understanding of how some flex stuff was built and both those resources gave me a pretty good understanding of what flex is, what it does and how to use it.
mmxl is just XML so if you are not familar with XML go to wc3 schools look it over then ehad to the above link.

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