SQL Server 2005 Express Edition (SQL Server Express) is the next version of MSDE 2000. It is a free, easy-to-use, lightweight version of Microsoft SQL Server 2005. To obtain additional information about SQL Server Express, visit the SQL Server Newsgroups on MSDN.
SQL Server 2005 Express Edition - Community Technology Preview June 2005 is unsupported pre-release software.
Download: SQL Server 2005 - June CTP
This is BETA software!, please use caution when installing it on your system