  We review multiwavelength properties of pulsar wind nebulae (PWNe) created by
supersonically moving pulsars and the effects of pulsar motion on the PWN
morphologies and the ambient medium. Supersonic pulsar wind nebulae (SPWNe) are
characterized by bow-shaped shocks around the pulsar and/or cometary tails
filled with the shocked pulsar wind. In the past several years significant
advances in SPWN studies have been made in deep observations with the Chandra
and XMM-Newton X-ray Observatories as well as the Hubble Space Telescope. In
particular, these observations have revealed very diverse SPWN morphologies in
the pulsar vicinity, different spectral behaviors of long pulsar tails, the
presence of puzzling outflows misaligned with the pulsar velocity, and far-UV
bow shocks. Here we review the current observational status focusing on recent
developments and their implications.
