You can watch live coverage at the link.
Follow it also on their Facebook page
https://www.facebook.com/OrbitalSciencesCorp
and on Twitter.
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Orbital’s mission webpage
http://www.orbital.com/NewsInfo/MissionUpdates/Orb-2/default.aspx
Cygnus launch cargo manifest
http://www.spaceflightnow.com/antares/orb2/launchmanifest.html