Based on yesterday duscussion with my colleague. I want to mention how much is SunSPOT project open source. There are really good ways how to contribute to this amazing project.
Because I haven't easily found one site where are all opensource projects placed together. I decided to do that (instead Mike's article of course - SunSPOT hardware open source) to increase success 
. Here it is. Enjoy !
SPOTs project - here you can find all projects
eSPOT Main Board
eDemo - demonstration board for SunSPOTs
eFlash - MiniSD card reader/writer add on board for Sun SPOT eSeSerial - RS232 interface board for the Sun SPOT
eProto - simple prototyping board for the SunSPOTs
eProtomega - Atmega88 prototype board for SunSPOT
solarium - SunSPOT simulator
And for the first time users is very good to have basic experience what the SunSPOT is. In this case there are some demos.
spots-sdk-demos
