Chern-Simons terms on noncommutative branes

We write down couplings of the fields on a single BPS Dp-brane with noncomm utative world-volume coordinates to the RR-forms in type-II theories, in a manifestly background independent way. This generalises the usual Chern-Sim ons action for a commutative Dp-brane. We show that the noncommutative Cher n-Simons terms can be mapped to Myers terms on a collection of infinitely m any D-instantons. We also propose Chern-Simons couplings for unstable non-B PS branes, and show that condensation of noncommutative tachyons on these b ranes leads to the correct Myers terms on the decay products.