Website should have picture of HyperspyUI in action
As title says, http://hyperspy.org/hyperspyUI/ should have an image demonstrating the GUI. Using the image typically put into papers would be a good idea.
What about a gif-demo like this?

Only thing is it's a little large at 2.3MB
A resized version is only 980kB...
With a description like the following:
In this demo, we show the loading of an EDS spectrum image from core-shell nanoparticles collected off of the TEM. Using HUI, it's simple to brows the spectroscopic data, and quickly obtain peak intensity maps for the elements present (Fe and Pt). Clicking on the "BSS" button allows the user to quickly perform a blind source separation on the data, separating it into independent factors. Performing this analysis on the nanoparticle data clearly shows the spectral data from the core, the shell, and the carbon support film on which they are standing.
Seems good, but it would maybe be better if the original was captured in a lower resolution (instead of being scaled down) so that the capture has a higher fidelity for fonts etc.