  In the coming decade, the LIGO/VIRGO/GEO network of ground-based
kilometer-scale laser interferometer gravitational wave detectors will open up
a new astronomical window on the Universe: gravitational waves in the frequency
band 10 to 10^4 Hz. In addition, if the proposed, 5 million kilometer long,
space based interferometer LISA flies, another window will be opened in the
frequency band 10^(-4) to 1 Hz. I review the various possible sources that
might be detected in these frequency bands, and the information that might be
obtainable from observed sources. This article closely parallels my talk at the
GR15 conference, but is updated to include discussions of some recent
developments.
