Once you have the system ready, download the LDoms software, and it's free. You may want to read the architecture white paper and the BluePrints article to plan the deployment. Be sure to check the LDoms 1.0 documentation as well.
Want to see a demo? up to 32 independent logical domains - each with its own OS instance running on a single CoolThreads server.
Meanwhile, you can explore the blogs for additional information.