  We describe a new class of boundary conditions for AdS_{d+1} under which the
boundary metric becomes a dynamical field. The key technical point is to show
that contributions from boundary counter-terms in the bulk gravitational action
render such fluctuations normalizable. In the context of AdS/CFT, the analogue
of Neumann boundary conditions for AdS promotes the CFT metric to a dynamical
field but adds no explicit gravitational dynamics; the gravitational dynamics
is just that induced by the conformal fields. Other AdS boundary conditions
couple the CFT to a gravity theory of choice. We use this correspondence to
briefly explore the coupled CFT + gravity theories and, in particular, for d=3
we show that coupling topologically massive gravity to a large N CFT preserves
the perturbative stability of the theory with negative (3-dimensional) Newton's
constant.
