  The first generation of ground-based interferometric gravitational wave
detectors, LIGO, GEO and Virgo, have operated and taken data at their design
sensitivities over the last few years. The data has been examined for the
presence of gravitational wave signals. Presented here is a comprehensive
review of the most significant results. The network of detectors is currently
being upgraded and extended, providing a large likelihood for observations.
These future prospects will also be discussed.
