There's been some good articles in ancient issues of "Bananafish" and "Opprobrium" mags, on the likes of Hijokaidan, High Rise, early Fushitsusha etc. Not aware offhand of any English language books on the Japnoise scene - I'd imagine there'd be a least a couple of Japanese language books though.
Here be a Merzbow interview:
http://www.musiquemachine.com/articl...late.php?id=73