MSDN: “Several questions have come up lately regarding whether SQL Server Express is an appropriate product to be used in a hosting environment.”

“All versions of SQL Server including Express Edition are RECOMMENDED for dedicated (single-tenant) hosting environments.”

“There is a tool called the Database Publishing Wizard (it comes bundled with Visual Studio 2008) to help the export/import process.”

[http://blogs.msdn.com/sqlexpress/archive/ 2008/02/22/sql-server-express-and-hosting.aspx]