The PDF you linked to shows an interesting approach of rigid foam insulation over the fiberglass batts. I'm considering doing that (for the reasons mentioned in the article, the additional R3 or so, and because it would do a better job at holding the fiberglass in place than tension wires).
Really, the only thing I'm worried about is not being able to see into it to check for moisture. I'd have to pull off one of the panels everytime I wanted to take a peek. Well, that, and then there's the problem of not having a crawlspace access hatch in the foundation wall, so I have no idea how I'd get the rigid foam panels into the crawl space in the first place
