  A small number of double-lobed radio galaxies are found with an additional
pair of extended low surface brightness `wings' of emission giving them a
distinctive `X'-shaped appearance. One popular explanation for the unusual
morphologies posits that the central supermassive black hole (SMBH)/accretion
disk system underwent a recent realignment; in a merger scenario, the active
lobes mark the post-merger axis of the resultant system. However, this and
other interpretations are not well tested on the few (about one dozen) known
examples. In part to remedy this deficiency, a large sample of winged and
X-shaped radio sources is being compiled for a systematic study. An initial
sample of 100 new candidates is described as well as some of the follow-up work
being pursued to test the different scenarios.
