Wow... It's very hard just to choose ONE.
I'd say this is has to unique - that means I probably wouldn't able to find their stuff elsewhere. So it has to be a specialty site. With TL, FTN, RevTT, etc., they're all 0-day general trackers. It could be replaced by other trackers.
Here is my selection: Mvids ( I couldn't think of one which can replace it)
Even with Bitme or BitmeTV, they can be replaced by other E-learning or TV trackers.
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