I wish all the people that go to Wacken a good time. Here are two links to live-streams over the web where you see and/or hear some bands if you can't be there.
German radio station NDR will stream part of the Wacken shows. More info and
the stream can be found here:
Wacken web stream by NDR radio
And the german TV station also streams some video footage in their channel (digital satelitte or cable required) or even better can be accessed online at:
Wacken TV stream at ZDF kultur
Update: NDR will not "only" stream on the festival days, but extend to show stuff on Tuesday, 9. August on their web-stream!
The same thing goes for ZDF kultur, but is limited to showing stuff on TV.