Bamboo.Prevalence - a .NET object prevalence engine
Here you can find a .NET implementation of the object prevalence concept. It seems to be an O-R mapping concept, without using an relational database as back end. I've looked at it briefly and it seems the trick is that all the objects are serialized and saved to disk. I like the idea behind it, but my concern is the lack of high performance search capabilities (such as indexes in a rdbms). But, as I said, I haven't tried it... Maybe someone else has any experiences with it?