Optomechanics deals with the interaction between light and micro- or nanomechanical motion. It is a field that has made tremendous progress over the past few years, and there is currently a wide range of experimental and theoretical activities in many groups all over the world. The goals range from fundamental questions in quantum physics to applications in signal processing, sensitive measurements, and in quantum information and communication. The typical setup comprises a laser-driven optical cavity coupled to some mechanical resonator which is acted upon by the radiation pressure of the circulating light. Our future research will focus on multimode systems (i.e. optomechanical arrays, e.g. implemented in photonic crystals), the effects of ultrastrong photon-phonon coupling, and applications in quantum information processing and communication or even in classical signal processing.