Check these out, totally awesome invention - CineSkates Camera Sliders by Justin Jensen, an MIT grad. Making smooth filming possible without expensive, bulky equipment.
Here's the link:
http://www.kickstarter.com/projects/jj1/cineskates-camera-sliders?ref=live
Video: http://www.youtube.com/watch?v=K6ZgQQxk2no
Actor, photographer, writer, yogi based in Hong Kong....I create stuff http://www.imdb.me/ineslaimins/