A new paper Three-photon energy time entanglement by Krister Shalm, Deny Hamel, Zhizhong Yan, Christophe Simon (U Calgary), Kevin Resch, and Thomas Jennewein appeared in Nature Physics advance online publication today.
Story on IQC website.
Update Jan 31, 2013: Research Highlights in Nature Photonics, Tripartite entanglement by Noriaki Horiuchi.