Habitable Earths in known circumbinary systems

Where to Find Habitable "Earths" in Circumbinary Systems
http://arxiv.org/abs/1304.2895

According to this, habitable planets at Kepler-16 may be possible in the 1:1 resonace with the giant planet, would require ~3 years of transit timings to an accuracy of 0.001 days.

Kepler-47 may have stable regions at the boundary of the HZ.

Kepler-34, 35 and 38 seem to offer better stability prospects, but longer detection times. (The TTV from an Earth in the Kepler-35 and Kepler-47 systems would be too small to detect at this precision).