Entertainment tonight is streaming Live from Comic-Con, you can watch it here
Dreadcentral.com are also covering it here
And Omg Celebrity News are covering it here
Another one UStream here
I don't know which link is the best but at last there are a few options if any of them start to freeze up (which will probably happen from past experience !)
If you're outside the US I think one of the bottom three might be your best option (just saying, don't hold me to it ;-))
According to the Comic-Con website the panel is on from 1.30-2.45 PST get there a bit earlier (just in case) and there's a press conference at 9.30 PST and is being covered on ET !