Abstract
Observations of early-type binaries not only allow us to establish the fundamental properties of massive stars in a model-independent fashion, but furthermore provide important information on the interactions of their stellar winds. The signatures of wind-wind interactions have been found over a broad range of wavelengths and energies, from the radio domain to X-rays and possibly γ-rays. In this review, I discuss some results of the study of wind interactions in Wolf-Rayet and O-star binaries.
