Download Microsoft SQL Server 2008 Release Candidate 0 (RC0) and preview the latest features of SQL Server 2008! The SQL Server development team uses your feedback to help refine and enhance product features. Evaluate SQL Server 2008 RC0 today and send your feedback. SQL Server 2008 provides a comprehensive data platform that is secure, reliable, manageable, and scalable for your mission critical applications. With it, developers can create new applications that can store and consume any type of data on any device, enabling your users to make informed decisions with relevant insights.
SQL Server 2008 RC0 will automatically expire after 180 days.
Abstract courtesy : Microsoft
Reference : Pinal Dave (http://blog.SQLAuthority.com)