  We review properties of Galactic VHE sources detected at TeV energies. The
number of associations between the VHE sources and pulsars has grown in recent
years, making pulsar-wind nebulae the dominant population, although there is
still a substantial number of VHE sources which remain to be identified. Among
the latter there are several "dark" sources which do not have plausible
counterparts at any other wavelengths. In this review we compile and compare
the TeV and X-ray properties of pulsar wind nebulae (PWNe), PWN candidates, and
unidentified TeV sources.
