The former SQL Server 2005 Mobile Edition is now called SQL Server 2005 Everywhere Edition (actually, this was way back April 2006). Check out
http://blogs.msdn.com/stevelasker/archive/2006/04/10/SqlEverywhereInfo.aspx
This was actually changed to SQL Server Compact Edition
stuff can be found here:http://blogs.msdn.com/sqlservercompact/