For Pacquiao-Cotto, the streams on justin.tv will likely be shut down by HBO.
There is a program called ''TVU Player'' which is basicaly like Sopcast. Visit this link to download it:
TVU download
After download, install it...then a few seconds after you install it...click to open it...
OPEN
in the green highlighted area you will type this # (66563), that's the LIVE STREAM.
But the broadcasting will be just for the main event, starting at 9:30pm or at 10:00pm Eastern time - depending how quick the undercard fights end.
This stream CANNOT get taken down by HBO, since it's not a web stream like Justin which allows HBO to track it and delete it...this is a program INSTALLED in your pc, they don't have access to this, they can't take it down. TVU worked beautifully for the Fedor fight last weekend.
If for some unforseen reason TVU doesn't work, Sopcast should be streaming the fight as well.