The wiki certainly enlightened me, I haven't really been following them since the downward spiral, I got into them with 'Pretty Hate Machine'.
I so pleased for Reznor that he's embraced things like Bit Torrent, and shaken off the big corporations, and seen that he can give away 400gb torrents of live concerts, and yet still sell out of $300 limited edition albums from his site.
I was very surprised to read that the military had been using his music for purposes of torture too, that's just offensive on so many levels to an artist.
Honestly, I think Reznor's just ahead of his time, and more and more bands are going to just move to selling thru their own site, maybe hiring a web guy to do all that instead of handing a 40% cut to Universal or whoever.
It's pretty bad when you read that his record company were selling NIN cds at $35 when a regular cd was nearer $21 'because NIN fans will pay it'. Fortunately now it's so much easier to buy both internationally and digitally.
As my addition to the recommendations, as everyone seems to be offering up more hardcore, less 'mainstream' stuff, I'll go the other way, with Pitchshifter, like NIN, they've very much evolved their sound over the years, both losing and gaining fans every step of the way.
Compare
with
Personally I prefer the later work, and didn't know they'd kept going, so I'm off to try to find some samples of their 2008 stuff!