I was just trying to get a handle on
the new technologies and was wondering if
some one could give me some insight. I have
gathered several statements below but am still
unclear how everything fits together.

Flex Builder is a development environment
for developing RIAs.

Flex is also a development framework where
any editor can be used to develop Flex applications.
Adobe Flex Builder is just Adobe's solution to developing
Flex programs.

Flex Builder can also be used to develop AIR applications.
Flash or HTML/AJAX can also be used to develop AIR applications.

AIR runtime needs to be installed on a machine in order to
run AIR applications. Is this equivalent to Flash Player needs
to be installed on a machine in order to run Flash applications?

So what is the difference between the Flex framework and AIR
framework? I have seen where an AIR extension needs to be
installed for Flex Builder. What is the default that Flex Builder
publishes to, a Flex exe?

Both frameworks seem to be based on AS3. I have read a developer can
use Flash, Flex, HTML, Javascript, Ajax to build AIR files but am still
unsure how Flex and AIR files are different.

Thanks