writes: "In the spirit of some work begun by Neal McBurnett a few years ago, there is a June report of keys from global keyservers. This report covers about 1.5 million keys, from a 1.7GB public binary keyring, focusing on keys that are nearest the center of the web of trust. Using a GnuPG key? This will tell you where you stand in the overall rankings, as well as signatures to look for. Not using one? Maybe you should be."
This would be worth reading for the explanation of the analysis