What are the benefits of running chef-server instead of chef-solo?

I am going to orient this answer as if the question was "what are the advantages of chef-solo" because that's the best way I know to cover the differences between the approaches. My summary recommendation is in line with others: use a chef-server if you need to manage a dynamic, virtualized environment where you will be adding and removing nodes often. A chef server is also a good CMDB, if you nee