This is from a QTVR file with 2456px cube faces, output to 1280x720px HD @ 30fps.

The larger version is 37MB and was reduced to 20,000kbps h264 in QuickTime Pro to make it a more reasonable size for the web.

The smaller version is 5.6MB, and was reduced to half size and 8,000kbps in QT Pro.

The original panorama can be seen here.