I know I had answered this. The server had a "hiccup" on 4/7/2009, just a few days after this post, and the reply I made appears to have been lost. Sigh...
I've never had any luck with converting SWF to anything else. It's not very friendly to work with.
But when you made this post, I looked around, and was successful at converting a Mario Bros parody video from the Newgrounds website. It may have been the SWF2AVI converter that I tried, but I recall the audio lost sync on it.
I'll look into this again, when I get a chance. I almost think I found a
VirtualDub work-around, will need to re-test.