From Roger Meike’s Blog:
For those of you who have been following the story of Sun SPOTs for a while, you know that this has grown from a little Sun Labs research project into quite an endeavor. Sun SPOTs are used around the world by students, researchers and hobbyists whose creative minds apply them to exciting new applications every day. We originally built the Sun SPOT as a platform for our own research. They worked out very well, but we pretty quickly realized that they were just too much fun for us to just keep in our labs.
More info here.