Binary systems are today well established gamma-ray emitters, and the variety of the processes responsible for this emission is a hard act to follow among any other high-energy source class. After years of extensive theoretical modelling and complex MHD simulations predicting binary systems to be gamma-ray emitters, the last generation of GeV/TeV detectors have finally confirmed these perspectives, and have unveiled a rich phenomenology associated to these sources in the gamma-ray domain - including a number of observational facts which were not foreseen just a few years ago. Here we highlight some of the most relevant results on binary systems at gamma-rays obtained in the last years, from the bright and periodic emission in gamma-ray binaries hosting a non-accreting pulsar to the detection of gamma-rays produced in the jet/medium interaction regions in microquasars, and the discovery of gamma-ray emission following powerful explosions in novae systems.