Be it the warez scene mentioned elsewhere in the thread, or simply the pirated movies/games scene, it formed such an integral part of my childhood. The whole aXXo/KlaXXoN debacle, the sheer respect for SkidRow for being able to deliver awesome games in a playable crack within days of their release, and purely the sense of community around, of all things, pirating content, was incredible. It sounds weird to say, but in many ways, it felt like a global movement to "stick it to the man" and keep control of the internet.
TBH I'm still a bit upset that mininova closed down because compared to TPB/RarBGe etc, I always felt like mininova was a much tighter knit community (and let's not even get into the whole eMule/Demonoid/Napster community).