well, I tried that program on the xXx trailer at divx.com. the program threw a null pointer exception in OS X and in classic, but completed the process in OS 9 proper. Of course, my roommate couldn't play the file on Windows ME. So I guess I'll wait for the 1.0 release...
Anyone else, please post your results here (and in the divx.com thread, so the developer can actually fix these bugs)