With the caveat that this may not be fully joined up thinking yet...
With a reasonably narrow search/filter: Capacitor, X7R, 1uF, 50V
Y axis - is the row count of the results
The (discrete) X axis might be package size 0603, 0805,...
This gives a frequency distribution, of the most common package types for specified cap.
Now relax the voltage filter to range of 10-50V. And plot one trace per voltage (on the same XY) to show frequency distribution of packages at different voltages.
Ok, I am sort of using frequency of parts, to hint at pricing/availability. So another step could be to use price as the Y axis if appropriately averaged.
X-Y, line chart, or cross filter all tend to show curves, so either could be used to understand the space better. Sure, it would be nice to interact with the chart to modify the existing filters, but that wasn't the primary driver behind my thoughts.
tomacorp makes a valid point that with a proper data export function, this, and much more, can be achieved using ad-hoc tools too. Consuming raw data is always good om nom nom nom