Neo4j is a Graph Database that makes dealing with complex data much easier by providing an intuitive data model (the property graph) and providing a high performance, fully ACID compliant database that can traverse billions of nodes and relationships at orders of magnitude higher speeds than relational databases.
Also, graphs are great not only for data storage but for very cool visualizations, see e.g. http://mbostock.github.com/d3/ex/force.html and others.
Screenshot from http://maxdemarzi.com/category/visualization/, built on Neo4j
If you want to know more, feel free to join the Neo4j India meetup group or drop in on the forums. Also, there will be a conference in San Francisco dedicated to graphs in November, http://graphconnect.com.
May the source be with you!
This is a sponsored blogpost from Neo4j