Any number of the Islandora/discoverygarden solution packs may be of value to the DH community depending on what they'd like to examine, and how they'd like to extract value from their digital assets.
The solution pack you're speaking of, The Islandora Critical Edition Solution pack was designed to allow a single book to be analyzed in depth. The still-evolving CWRC editor was used to clean up the automatically generated OCR, and mark it up. The markup could be either TEI, RDF, or both.
This solution pack formed the base for a newer far more comprehensive solution pack which is nearing completion now. The newer solution includes collation, and the ability to incorporate a number of separate assets into a single critical edition with its own critical apparatus. The hugely expanded version is not yet ready for release. The older Critical Edition pack should still be useful, but it hasn't been under active development for almost two years.
It would be worth installing at this point to see what (if anything) has to be done to bring it in line with current Islandora.