there are a few ways to do this.
first off, the easiest and most effective- buy the "illustrate 4.0" plugin for max 2.5 and above- its about $400.00 and allows you to render and output directly to swf.
export your scene as a .3ds mesh and pull into poser 4.0. turn on the cartoon shader and animate your scene. then export as a jpeg sequence. then pull the jpegs into photshop and save as .tif's. next, pull the tiffs into streamline or freehand then batch convert to illustrator eps and pull the whole sequence into flash. it's not the prettiest of the two and it is time consuming, but it does work.
hope this helped.
(of course you can always bring the jpegs into flash and have it trace them out but the file size severely increases and may cause slow down.)
of course if someone out there has a render
plugin for max that can put out .ai format
(as rhino does I hear) all problems would be solved. I haven't found this mythical beast tho'
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