Another similar program is PPLive (also primarily Chinese). From a technical perspective it's quite cool stuff (if you google around you can find papers on the

Another similar program is PPLive (also primarily Chinese). From a technical perspective it's quite cool stuff (if you google around you can find papers on the implementation and how they deal with buffering, etc) and I'm surprised it hasn't taken off in the US sooner - a great example of China innovating in software (as opposed to the constant copying pointed out by others).