Hella!!
I want to say about this tool-FlashConv 1.3 on flashconv.com.
For me its very effective and usefull tool!
You can convert avi, mpg, mpeg, wmv, mov, asf, mp4, etc. into swf and flv flash formats...
Also I think that quality is really great so its cost 39.95 USD.
Good Luck=)))