Comparision between Modules and SWF files

I've used modules and SWF files in my flex apps but don't
seem to see or figure out what the basic difference between the two
is.
I'm interested in comparisions *excluding* file size. For
instance:
When would one use SWF files instead of Modules?
Are there things possible/not possible when using one or the
other?
Any other pros/cons?

Obviously you can use Application SWFs to break a large
application into dynamically loaded parts. Modules were created to
address the ease-of-use issue. Module SWFs provide an easier
mechanism for communication between the Modules and main (shell)
application SWF. Modules also give us a way to enhance that
mechanism in the future which would be limiting if working solely
with Applications.
Further, Modules can be reduced in SWF-size compiling them
against the symbols loaded in the shell application. This makes
them much smaller and faster to download. That was possible with
Application SWFs by using Runtime Shared Libraries. However, using
RSLs is tedious compared to using Modules.
I have an example of using Modules on my blog. The example
covers the size optimization of Modules as well as communication
with Modules.

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