  A small number of double-lobed radio galaxies (17 from our own census of the
literature) show an additional pair of low surface brightness `wings', thus
forming an overall `X'-shaped appearance. The origin of the wings in these
radio sources is unclear. They may be the result of back-flowing plasma from
the currently active radio lobes into an asymmetric medium surrounding the
active nucleus, which would make these ideal systems in which to study
thermal/non-thermal plasma interactions in extragalactic radio sources. Another
possibility is that the wings are the aging radio lobes left over after a
(rapid) realignment of the central supermassive black-hole/accretion disk
system due perhaps to a merger. Generally, these models are not well tested;
with the small number of known examples, previous works focused on detailed
case studies of selected sources with little attempt at a systematic study of a
large sample. Using the VLA-FIRST survey database, we are compiling a large
sample of winged and X-shaped radio sources for such studies. As a first step
toward this goal, an initial sample of 100 new candidate objects of this type
are presented in this paper. ...[abridged]
