Dan,

I'd never really thought about it in the terms laid out in that article either. I just googled it to find a good explanation for Wyndham and found the article after looking over several others.

I don't use a capo that often, but in the given example of the chord progression, it probably would sound better with a capo because of the open strings made possible by using the capo.

Plus you could still throw in the barre chords to mix up the progression.

I'm gonna bookmark that page for the next person that asks about how to use a capo.

Bob
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http://soundcloud.com/bobcflatpicke/music-in-the-mountains