Some interesting experiments (the source: Youtube):

Feather & hammer drop on Moon

NASA Free Falling

Experiment Driven mechanical oscillator

Physics of sound

Amazing resonance experiment (2D)

Wine glass resonance in slow motion

Standing waves Animation

Doppler effect and shock waves

The Doppler effect

The sonic boom explained

Resonance experiment 2

Wave reflection and standing waves

Cool sound and water experiment

MIT experiment with bike wheel (Gyroscope)

Gyroscope-explained

Melde's string

Kund's tube

Supercooled water (surfusion of water)

Additional interesting lectures:

Leonard Susskind's online Physics Lectures
(Stanford University)

Usefull links:
- Soudcard Oscilloscope/Signal generator (or local download)
- Video Analysis and Modelling Tool: Tracker

+ download pendulum.avi example, Tracker software (Win32)

+ Tutorial for Tracker use (French)