The old High Definition Earth Viewing (HDEV) experiment's term of service expired and the Live Feed cameras are being used to fill the void. The HDEV link is still active though and carries the Live Feed video image (lower definition) too. What's best about it is that the ISS Tracker is still working and appears below the video when you click on the ISS Tracker icon. It's nice to still be able to see where the ISS is over the Earth. I usually keep a couple of windows open to see both the ISS and follow its relative location:
http://www.ustream.tv/channel/iss-hdev-payload