I just discovered vimeo.com, which (at least from I've seen so far) looks like it has higher quality videos on average than YouTube... And I found some really high quality videos of the NIN Lights in the Sky tour from 2008. Unfortunately, I couldn't find any from the specific performance I attended (you can look to my last blog post for some lower quality videos of that), but the high quality makes up for it. Some of the videos are actually "multi-cam", meaning that somebody arranged clips from multiple perspectives into a single video, which is pretty cool. It's not exactly how I experienced the concert (I stood in one spot the entire time), but it's still interesting to watch.
Here are some of the videos I found on vimeo.com:
Nine Inch Nails - 999,999 / 1,000,000 (Lights In The Sky Tour, Multi-Cam) from Esther Derive on Vimeo.
Nine Inch Nails - Discipline (Live in HD) from WhoRu? on Vimeo.
nine inch nails decide to rock harder than anyone ever from partyunderground.net on Vimeo.
Down In It - Nine Inch Nails from Jessica on Vimeo.
Nine Inch Nails - In This Twilight - Sacramento, CA from victoria w on Vimeo.
Nine Inch Nails - Hurt - Portland, OR from victoria w on Vimeo.
Nine Inch Nails - Discipline - Red Rocks from victoria w on Vimeo.
NIN "Echoplex" Vegas 12/13/08 *HD* Nine Inch Nails DMC-TZ5 from Joe Mancino on Vimeo.