Hot off the press - Microsoft SQL Server 2005 Compact Edition has just been released and can be downloaded from this website.
Microsoft SQL Server 2005 Compact Edition is the next version of SQL Server Mobile adding the desktop platform. SQL Server Compact extends the SQL Server Mobile technology by offering a low maintenance, compact embedded database for single-user client applications for all Windows platforms including tablet PCs, pocket PCs, smart phones and desktops. Just as with SQL Server Mobile, SQL Server Compact is a free, easy-to-use, lightweight, and embeddable version of SQL Server 2005 for developing desktop and mobile applications.
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