VistaDB 2.0 data engine for .NET has been released. VistaDB is the #1
alternative to Jet/Access, MSDE and Xbase for building small to midsize
WinForms and ASP.NET database applications. Robust data engine with SQL-92
support features a small 1MB footprint, single-file data store, rich data
types, billions of rows per table, transaction processing, managed ADO.NET
Provider, VCL components, visual utilities, XCOPY deployment, zero
configuration with free unlimited distribution, and much more.
More info: http://www.vistadb.net