He's been threatening it for a while, but finally Trent Reznor has put his money where his mouth is, and is 'doing a Radiohead' (late-2007's most popular phrase), by releasing 36 instrumental tracks purely on the internet, with optional price sets. Most of the casual Nine Inch Nails fans will no doubt go for the freebie option, 'Ghosts I', which is the first nine tracks from his Ghosts I-IV collection. They're available as DRM-free MP3s along with a 40-page PDF. Going up the pricing ladder, for $5 you can buy Ghosts I-IV, which is all 36 tracks, then for a tenner you'll get a double-disc set with a 16-page booklet, plus a download of the album for lazies who can't be bothered to rip the CDs. This option won't be available until April 8th, however. Now, here's where the hardcore NiN followers prick up their ears: $75 will secure you the 'deluxe' edition of Ghosts I-IV which will...