HNW discussion is gaining momentum.
On heathen harvest a gentleman named Vargr Wulf has done a couple reviews. A simple search for 'harsh noise wall' will show you these.
Over on musique machine a certain Roger Batty has had nothing but good things to say about various HNW releases and has also done an interview with Vomir and the Rita.
And on the chondritic sound forum one who goes by the name Jliat has posted some important thoughts about the philosophy/ideology behind HNW which makes for interesting reading.
Mr Jliat has said more on his own (impenetrable) website and included links to a random HNW generator which will provide you with hours of (no) entertainment.
[click each paragraph for links]