Babelgum touts itself as an on-demand free broadcast quality service. This sounded a lot like Joost. So, I decided to visit their site and try it out. Unfortunately, I was using a Mac at the time and Babelgum only offers a Windows client. I could have fired up Parallels and run Windows in a virtual machine. But, my interest had already waned. If you've tried both Babelgum and Joost, please let me know how they compare.