Great article. This particular issue is a huge problem and was in place for many years in my current environment which we now have to go back and fix (clustered GUID indexes).

The idea disk space is in anyway less expensive is true for home users or very small businesses, but at the enterprise level, especially for SQL Server, it is still the largest expense in place for IT; easily in the multi 7 figures even for a medium size business running a small number of servers (less than a 100). Generic space is less expensive, IOPs per GB are damned expensive. 🙂