It is one of those "Why didn't I think of that" kind of ideas. The delicate simplicity of the small red dot guiding you along is probably the only way to improve on one of the oldest tools of all time.
The idea came to me in a flash while I was working at the Pier 9 workshop in San Francisco. Most of the tools already have laser guides these days. It just seamed strange that the hammer had been left out of having it's own shiny dot helping the user know where the business end of the tool was about to land. Combining the digital precision of a laser with the brute power of a hammer is a natural pairing.
This is a quick, easy, and affordable project which is accessible to all levels of makers.