This is a video made by Eepybird (the guys that do the Diet Coke and Mentos geysers) entitled 'The Sticky Note Experiments'. It was made using 280,951 Post-Its stuck together to form Slinkies (that's over a quarter million for those of you that like your numbers in fractions and words). It was very well done. I just wish I could have embedded a larger version of it. And invested in 3M stock.
Eepybird's post it note experiment [vimeo]
Hit that for a larger version.
Thanks to Rami, who once made a Diet Coke and Mentos cannon and blew up a tank.