  We study deformations of certain crepant resolutions of isolated rational
Gorenstein singularities. After a general discussion of the deformation theory,
we specialize to dimension three and consider examples which are good (log)
resolutions as well as the case of small resolutions. We obtain some partial
results on the classification of canonical threefold singularities that admit
good crepant resolutions. Finally, we study a non-crepant example, the blowup
of a small resolution whose exceptional set is a smooth curve.
