Hi!
It's often difficult to explain the effects of unequal temperaments to people who haven't experienced them and sometimes often who simply have heard that unequal temperaments have "bad" keys. In fact no keys are bad - they are just different. Composers exploited those differences.
I have done a video with another approach to explaining the differences between the keys in terms of resonances or harmonic accordance:
http://www.youtube.com/watch?v=Pz0B0SwKpww
I hope it's useful and look forward to further ideas or comments . . .
Best wishes
David P