Here are the slides for my presentation on graph databases at the TriPUG meetup tonight: http://www.slideshare.net/JoshAdell/graphing-databases
Overall, I think it was pretty well received. I didn't mean for it to last an hour and a half, but there it is. There were a lot of new folks there; I'm encouraged at the enthusiasm of the developer community in the Triangle region. Thanks for having me!