This talk reports on results on the deformation quantization (star products)
and on approximative operator representations for quantizable compact K"ahler
manifolds obtained via Berezin-Toeplitz operators. After choosing a holomorphic
quantum line bundle the Berezin-Toeplitz operator associated to a
differentiable function on the manifold is the operator defined by multiplying
global holomorphic sections of the line bundle with this function and
projecting the differentiable section back to the subspace of holomorphic
sections. The results were obtained in (respectively based on) joint work with
M. Bordemann and E. Meinrenken. (Talk at the XXI Int. Coll. on Group
Theoretical Methods in Physics, 15-20 July, Goslar, Germany)