Since the initial concept of speckle interferometry was published more than 30 years ago the subject has matured to the point where it is now an engineering tool used in a wide range of applications with instrumentation available from a number of companies. The development of the technique to this level has been accomplished by making use of parallel developments in a range of technological areas. These are the laser, the PC, and the CCD camera. More recently the incorporation of optical fiber technology has also had a major impact. This paper reviews recent developments in the optoelectronic technology used in speckle interferometry instrumentation and the use made of it in a range of application areas.