Main Question or Discussion Point
This paper http://arxiv.org/abs/1003.0658 nails down the interpretation of a binary white dwarf system with an orbital period of only 5.4 minutes, versus 8 hours for the celebrated Hulse-Taylor binary neutron star system. This would probably be the strongest source in the sky of steady sinusoidal gravitational waves. The shortening of the period has been measured with good precision (although not as spectacular as the precision of the Hulse-Taylor system). The masses of the stars are only roughly determined, so it doesn't provide the same kind of high-precision test of GR that the Hulse-Taylor system does.