Nice! Redis really does have a great code base to work with. I previously wrote on article on adding a custom datatype, essentially walking step by step through each necessary modification.

If interested, this article can be found here: http://www.starkiller.net/2013/05/03/hacking-redis-adding-in....

This is quite cool. I have had a few frustrating experiences with graph databases before, but this, as a simple graph data store, looks promising.

Nice! Graph implementation in Red is could be really awesome!