The Release Candidate of Windows Home Server is now available for download. There is also a contest going on for people to create add-ins to extend the functionality of the product.
More information about Windows Home Server is to be found on the team blog.
Thanks for the information!
But when is the final version goiing to release?
Final version of Windows Home Server already released in July. You can refer to the announcement at Windows Home Server team's blog:
Come to join us for discussion about Windows Home Server on Singapore Windows User Group's forum: