I had a small WMV file that I wanted to convert into a stand alone flash video (not a FLV, a SWF) to stick on a website.

There are lots of seemingly poor options out there for doing this, but this one was perfect: http://www.youconvertit.com.

I uploaded the WMV and they had a number of output options, one of which was SWF.  They emailed me a few seconds later letting me know my conversion job was completed, and I downloaded the SWF, which worked just as expected.