@Duane: What about using different colors for harmonics or overlapping frequencies?
If you look at Parts 1 and 2 of the BADASS Display project, you will see videos showing all sorts of ways of displaying the info. One of them had the different colors changing horisontally -- each frequency having a different color.
I also like the "peak hold" type where the top-most dot on a frequency column hangs for a moment and then slowly falls.
The great thing is that -- once youve extracted the spectum info -- you can play with all sorts of ways of displaying it -- that's the part I'm really looking forward to -- I'm hoping to bring this to EE Live 2015! to show it off...