As mentioned in this video, a fully self-contained, modular, standards-based satellite is attractive to launch operators. But before watching it, can you guess any other reasons why a "satellite in a box" would be an important development in space exploration?
The Radio Aurora Explorer (RAX) team has published its science in peer reviewed journals. So while Cubesats are still used predominantly as technology testbeds for future astroengineers, they are increasingly capable of doing worthwhile science.
Here is a video of the Cosmic X-ray Background Nanosatellite, a two-unit Cubesat built in Kentucky.