Neo4J is a great tool - I have used it with the Ruby wrappers.<p>A little off topic but: I think that the AGPL (which is used for Neo4J) is a good license but I wish that dual licensed projects would be a bit more up front on what the cost of the commercial waiver is for various use scenarios. For me the issue is that I would like to know up front how much 'commercial' use would cost if I would happen to have a customer who could not live with AGPL license terms.
I found this presentation from Emil (Jan 19, 2010) much more informative than the podcast linked to from the release:<p><a href="http://nosql.mypopescu.com/post/342947902/presentation-graphs-neo4j-teh-awesome" rel="nofollow">http://nosql.mypopescu.com/post/342947902/presentation-graph...</a><p>Edit:<p>What's really intriguing is what they're going to roll out with v2.0 - instead of basic, customer-written sharding algos, they're going to supply automatic sharding based on graph clustering algos.
what are the main differences in the open source version and the commercial version other than not being able to distribute, and the customer support they offer.. do they place limitations on nodes between the two versions ?