I wasn't clear that you wanted to put Producer content on your PPT slide.
Usually people use Producer to output PPT and video together in a webpage.
Same with Move Maker -- I was answering from the assumption that you wanted
to put your PPT content in a Movie Maker file. Movie Maker will import a
bunch of still images, but it won't import your actual PPT file (animated
slides) as content.
I realize you did say
But I read this as using Producer or Movie Maker with PPT, which usually
means to get PPT into a different output format as opposed to putting
Producer or Movie Maker output *into* PPT.
So, as to the advantages of putting Producer or Movie Maker output on a PPT
slide, you're still back to Producer exports HTML and MM exports video.
You'd have to use an add-in, LiveWeb
http://skp.mvps.org/liveweb.htm, to get
Producer's HTML page to play in PPT.
I just downloaded Producer and made a test file, and if it exports movies, I
just don't see it here. I mean, you'll get WMV files as part of the HTML
conversion, but at least in my experience, they're probably not the type of
WMV files you'll want to put back on a slide.
Have you actually tried exporting a project from Producer yet to see what it
generates?