In the new issue (#110) of Dirty Linen magazine, there is a major review of the new Loomis House edition of Child's The English and Scottish Popular Ballads. Loomis House Press

Perhaps more interesting is the fact that Child's seminal work is now available on a CD-ROM, compiled by David Kleiman of Heritage Muse who was working from first editions belonging, among others, to our own Sandy and Caroline Paton. Heritage Muse

I quote from Steve Winick's article:
The digital edition... uses PDF files to create a fully searchable, hyperlinked version of Child's work. This has the obvious advantage [over the Loomis book version] of maintaining the pagination of the original book, but linking together the "additions and corrections" so you can jump easily from one to the next... Scolars... can now search Child's texts and his notes for keywords, which will save hours of rereading and note-scribbling. Words that appear in the glossary are hyperlinked to their glossary entry, and each glossary entry is hyperlinked back to the ballads where the word appears...
The digital Child offers considerable added content, as well...creating a place name index... along with a series of beautiful, full-color maps showing all the places mentioned in Child's ballads. Each place on the map is linked to its entry in the index, and each entry in the index is linked to each ballad in which that place is mentioned. You can thus jump easily from ballad to index to map, and back to ballad... The digital edition links each transcription to a MIDI file, so that by clicking on an icon you can hear the tune played through your computer. One more bonus... is an audio CD of [14] Child ballad performances by contemporary folksingers.

The CD-ROM/audio CD package sells for $100. Sounds like a good deal to me!

Cheers,
Michael