Post your favorite remixes, whether official or bootleg. I've collected several hundreds over the years I'm djing, some of which take a track and simply make it sound better on modern sound systems, others completely rework a track into a different style.
Riders on the Storm (Deep Disco Remix)
Radiohead - Reckoner
The Reflex Revisions (tons of stuff, from rock to disco and in between)
Tomorrow Never Knows (Leftside Wobble Psychedelic Festival Banger version)