Microlensing searches primarily probe planets in the cool regions of extra-solar systems, just beyond the "snow line" where the gas giants (Jupiter and Saturn) formed in our own solar system. The 4 microlensing planets discovered to date include two such gas giants but also two "cold Neptunes". I show that the latter discoveries imply that these objects, which are most likely "failed Jupiters", are probably quite common. I also discuss the future prospects for microlensing searches: microlensing is the best way to find Earth and sub-Earth planets with current technology and the only way to find old free-floating planets.