One of the main uses I can see - using the software 'as is' - could be in training. I know that many (if not most) PPL students struggle with the concept of airspace and how to visualize it in their minds - especially somewhat chaotic airspace as in the UK
Google Earth with this overlay should provide a real eye-opener to anyone learning about airspace and should make the whole concept much easier to grasp.
Also, flying through/into some tricky airspace for the first time (e.g. fields underlying a control zone a la Denham, etc), having a look at this airspace depiction before flying there would help positional awareness and perhaps reduce the 'zone busting' so often lamented in these pages.
Now of course, feeding the whole thing into a moving-map GPS would be pretty cool too
