Ustream gives you real time metrics. Have yet to find a service that offers a better measuring tool. I dont know much about Justin.tv's API. Techzentv have you used it yet?
I have not had a chance to actually use the API for Justin.tv. I am going to build another on-air light that works based on the stream status with the intention of it looking at Justin.tv. So I will be looking at the API in the next few weeks.
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