This is a short clip of me in my P-51B exploding a wounded B17. It's encoded with Divx 5 1-Pass Quality Based at 320x240 30FPS. I can't tell too much quality difference between this clip viewed at 200% and the same thing encoded at 640x480 and viewed at 100%. And the file size is over half as small.
Though I didn't run it on this, I've found that the VirtualDub Smart Smoother filter found
here can make some clips look better while dropping the file size down even a bit more.
B17 lights up the night skyD