The art of cinema no.4
One of my favourite scenes of all time, Dario Argento's two and a half minute tracking shot in Tenebre is epic. It took them three days to shoot the sequence, using a camera attached to a crane to get a seamless long shot without pauses or cuts.
The Argento formula is an interesting one; there's the usual suspects - pretty girls, gory murder scenes and red-herring characters, but also inventive use of colour, visual effects and amazing soundtracks (Tenebre's being by Goblin) which makes him one of the biggest influences on modern horror films.
Screencaps and clip from Tenebre