EOL Audio defines Neo-Folk

Fairly narrow and a touch dismissive, though not inaccurate...

EOL Audio : Neo Folk

"Perhaps one of the most extreme offshoots of goth, indeed arguably not an offshoot at all, but merely another dark, morbid style of music that appeals to dark, morbid people. Ironically, neo-folk (aka 'apocalyptic folk, especially when referring to Current 93) is music that's historically amongst the closest to the original definition of 'gothic', incorporating pre-20th Century passage, concepts and aesthetic (the medieval scene embraces this concept with greater authenticity, however)."