Being able to stream your raid live is not something new, but isn't something that is widely publicised outside of the core group!
The prime example of raid streaming is from Isnogud. His forum includes the necessary instructions to set your own up, should you wish.
A warning, to achieve any appreciable quality, he recommends:
“AT LEAST … DualCore, at least 2 GB Ram and 768 Kb/s Upstream at least.
I got QuadCore (Q9450), 8 GB Ram and about 1 MBit upstream. Good Videocard is a plus. I got a 8800 GTX.”
Most PQ raiders are UK residents with ADSL connections, typically fielding 512 Kb/s upstream.
Those members who volunteer to stream their raids are listed here.
Eritha's warlock-eye view, with reduced video quality & no audio, for near real-time experience. His PC isn't very good :)
Apneoa's stream Watch Ap do crazy, interesting things like slacking in hubs and spend what little money he has to then complain about it. (Working on quality issues)