digg's lazyboy at master - GitHub - because key-value datastores are currently all the hype (and because they are really more practical for some things than classic databases), I will probably take a look at Cassandra. Simply because reports on the web suggest it offers the best scaling possibilities. And because it is used in some large websites - specifically, for example, at Digg (which I find as a site to be stupid, but hey, they have a lot of traffic and run relatively stably) with lazyboy as the Python binding.