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On its own, the area chart is little used: Perhaps that should be encouraged! It can fit in well with other charts, however, to form a mixed chart when two Y axes are used.
The Bubble chart displays an X, Y location together with the relative size of each item. It is frequently used in market and product comparison studies
The quality control chart is highly specialised, but very widely used. CuSum (cumulative sum) techniques are in use in manufacturing and analytical facilities worldwide - yet they are virtually unknown outside the QC laboratory. Some disciplines have other techniques which are in daily use. The simple example on the left shows the differences occurring between sampling subgroups in a large production run. Many of the highly specialised techniques, such as V-masks, are beyond the scope of general-purpose packages, although those who require such facilities may find that the literature on their subject contains references to how standard packages have been adapted to fit these requirements.