  The ''Anomalous X-ray Pulsars'' (AXPs) are a small group of X-ray pulsars
characterized by periods in the 5-10 s range and by the absence of massive
companion stars. There are now 7 possible members of this class of objects. We
review recent observational results on their X-ray spectra, spin period
evolution, and searches for orbital motion and discuss the implications for
possible models.
