I went on the first tour, in May 2009. We had to quit half-way through the tour because it was too darned hot. December is a much better time of year! The coops ran the gamut from a tiny chicken tractor thingy to a huge enclosed coop/run built around a large tree. Everyone had things they would change about their setup if they had to it again. It was a good reminder that no design is perfect. One setup that impressed me in a "don't want to go there" way had a concrete slab for the entire run. The guy said he had to clean it every day, sometimes more often. Ummm... no thanks... Fortunately all the folks with dirt runs had much more realistic time frames for cleaning (every couple of weeks to every few months). That sounded reasonable, and made me much more willing to try chickens.
Wish I'd learned this on the tour but I didn't, so i'll throw it in here: Now that I have chickens, I would never again use a corrugated metal roof on the coop without some serious insulation. That metal roof may have been free (reclaimed roofing panels) but it drips condensation all over the coop in the winter and heats like an oven in the summer. Not quite so bad now that I put the semi-permanent shade cloth structure over the top of it, but still... next time I'll use wood and rolled roofing or shingles. Live and learn.