As I was reviewing the embedded databases, (installing firebird database) this is probably current.

VistaDB 2.1 database for .NET has been released
This 2.1 update includes over 60 improvements, including new support for .NET 2.0 and Visual Studio .NET 2005. VistaDB is a small-footprint, embedded SQL database alternative to Jet/Access, MSDE and SQL Server Express 2005 that enables developers to build .NET 1.1 and .NET 2.0 applications. Features SQL-92 support, small 500KB embedded footprint, free 2-User VistaDB Server for remote TCP/IP data access, royalty free distribution for both embedded and server, Copy 'n Go! deployment, managed ADO.NET Provider, data management and data migration tools. Free trial is available for download.

Note that that above is a quote from Vista (http://www.vistadb.net/blogoffer.asp?ref=blogger ) and after I get a copy of the download I wil post my thoughts.

Jarrad