Yeah, that's not a bad chart at all. I went in there with the attitude of "great, another frequency chart for people to find "how do I eq a ___", but left thinking "actually, that's pretty cool". Some of the interactive stuff and notes are definitely pretty useful, and I think it would be a great tool for people who are trying to get a handle on, as you've brought up, just what, say, 400hz, SOUNDS like on a number of different sources (and eventually on any given source by gereral feel).
It's kind of hard to remember what it was like back when I didn'w know what every frequency range on a guitar track sounded like because I'd never swept a parametric through the spectrum.