In doing a bit of research for what I want to add next to my on-going hedgerows, a very long work in progress, I came across a free ebook that I thought might be appreciated here. It is published by Midwest Permaculture and free. It suggests a number of guild possibilities, and just from a cursory review I would agree with many of the recommended plantings — they do well in much of the Midwestern USA.
I agree, it's a good one :) I'm south of them, in a bit different microclimate, but it is pretty general for this whole area, no seriously specific plants.
Midwest Permaculture Institute also put out a pdf titled "A Permaculture Primer" and one called "Midwest Permaculture's 80 favorite plants for Permaculture Guilds in the Midwest" I remember they came off their site, I have had them for a couple of years, so I don't recall exactly where on their site.
If I were doing a proper review of these I'd say :: I give these PDfs 9 out of 10 acorns, would definitely recommend them! :D