Parallel Coordinates view with threshold selections & brushing
It would be extremely useful to have a parallel coordinates view of data arrays, but especially if there were selection tools on the axes which would act as threshold filters on the data. Brushing linked to coloring in the views would also be nice for quick associations between data values and locations in the view. All of this would naturally extend to scatter (and other) plots, as well. I think the addition of this type of interactive probe/query capability would really enhance ParaView as a tool for understanding quantitative spatial data.
This is already supported, for the most part.