Star formation is an integral part of the processes that drive the evolution and formation of galaxies. Studies of star formation at high redshift are conducted in many wavelength bands; radio observations offer the opportunity to observe the star-forming gas itself. There are a few dozen high-z galaxies that allow glimpses of star-forming gas with existing radio telescopes. A summary of what has been learned from this small, heterogeneous sample will be presented, along with the prospects for this field with the EVLA and ALMA. A brief report on the status of ALMA construction concludes the talk.