We discuss some recent advances in multiple light scattering probes, or Diffusing Wave Spectroscopy, applied to colloidal systems: the DWS Echo technique allows recording the full intensity autocorrelation function with a single experimental setup. This is achieved by putting a fast rotating diffuser in the optical path between laser and sample. We show that the recorded (multi-speckle) correlation echoes provide an ensemble averaged signal that does not require additional time averaging. We will further discuss applications of this technique in DWS microrheology and we will present a new experiment that allows monitoring the drying of a colloidal thing film with high resolution.