  We demonstrate the production of ultracold polar RbCs molecules in their
vibronic ground state, via photoassociation of laser-cooled atoms followed by a
laser-stimulated state transfer process. The resulting sample of $X ^1\Sigma^+
(v=0)$ molecules has a translational temperature of $\sim100 \mu$K and a narrow
distribution of rotational states. With the method described here it should be
possible to produce samples even colder in all degrees of freedom, as well as
other bi-alkali species.
