SWF Compresser is a small application that utilises a simple windows interface to compress Flash 2, 3, 4, 5 and MX .swf files. The result is a lighter file that will only play in the Flash Player 6. When you use Flash MX, you can compress your .swfs files using the publish settings, if you dont have Flash MX, then you can use this tool. The funky thing is that this little application will also batch compress .swfs, so even if you have Flash MX, this feature may be worth the download.