The ez430 RF2500 port of the Contiki OS was created as the entry to the MSP430 Design Contest. Currently the port allows to use one RF2500 board as a terminal and another RF2500 board as a sensor node. For further development your may check out the source code from the repository of Contikiprojects (look for the directory with the same name as the server this blog is hosted on). Both the documentation and the source code archive can be found at its software page in this blog.