Some time ago I discovered, by the help of a colleague, a NoSQL database for SQL-server. More specifically a document oriented db-provider for SQL-server, written in C#.
Wait, what? It is called "No"-SQL for a reason! What do you mean?
Actually, now days, it doesn't really mean "No SQL". Let me use a (slightly shortened) quote from nosql-database.org:
NoSQL DEFINITION: Next Generation Databases mostly addressing some of the points: being non-relational, distributed, open-source and ...