Yes, 3vix is a great codec but not very well known. If you want small movie files I recommend Sorenson 3 that comes with Quicktime 5.02. Its a great codec that doesnt need an extra plugin. I currently experiment with the video abillities of Flash MX and Sorenson Squeeze. It compresses files really great and you can choose "swf" as output file. So nothing else is needed for watching it than the Flash 6 plugin for the browser. Sascha