Graph Database

Graph database are not about images or graphs and things like that :-). They are simply a database organized as a Graph, you don't have tables, you just have nodes and relations.
Interesting concept that can be applied in some kind of structure that we could need to have work with.

Too conceptual? Well I suggest you to take a look at the project Neo4j project. It is a java project that implements a graph database.
Take a look, investigate the examples, I am sure that you will find where to apply it easily (at least you will know that there is another option to your good friend Relational Database).

• Neo4j project page: http://neo4j.org/
• Neo4j introduction pdf: http://dist.neo4j.org/neo-technology-introduction.pdf