State of the Linking Open Data Cloud
The following diagram visualizes the data sets in the LOD cloud as well as their interlinkage relationships. Each node in this cloud diagram represents a distinct data set published as Linked Data. The arcs indicate that RDF links exist between items in the two connected data sets. Heavier arcs roughly correspond to a greater number of links between two data sets, while bidirectional arcs indicate the outward links to the other exist in each data set.

There is a section in the document focusing on compliance with best practices for data provisioning that is a detailed explanation of the Sir Tim Berners-Lee 5-star deployment scheme for linked open data
Original title and link: State of the Linking Open Data Cloud (NoSQL databases © myNoSQL)