As of today, this site is no longer using ClustrMaps. There’s no particular reason for removing it. I just don’t use any information from ClustrMaps, so I don’t see the point in having it activated 🙂 For the functionality it provides, it has always worked well for me. If you need the information/statistics provided by ClustrMaps, I highly recommend it.
Clustrmaps: ClustrMaps