RavenDB http://ravendb.net/ http://ravendb.net/ is an excellent document database written in .NET. It leverages lots of LINQ and C# 4.0's dynamic abilities to p

RavenDB http://ravendb.net/ http://ravendb.net/ is an excellent document database written in .NET. It leverages lots of LINQ and C# 4.0's dynamic abilities to provide a really clean API. I'm sure it'll soon be taking advantage of the new async stuff coming in C# 5.0 as well. It's open source as well. Well worth a look.