Mathematicians create videos that help in visualizing four-dimensional objects. Science News writes about it: seeing in four dimensions.
posted on Aug 24, 2008 - View this thread

Anybody remember Slow Bob In The Lower Dimensions? Turns out the short video, once a mainstay of early 90s late-night MTV, was created by one Henry Selick, director of, oh, The Nightmare Before Christmas, James and the Giant Peach, Monkeybone, and the forthcoming adaptation of Neil Gaiman's Coraline. A lot more on Selick; also, higher quality, alternate format (but slower loading) versions are available here.
posted on Jul 29, 2007 - View this thread

Sizeasy. A handy visual tool for comparing all manner of different rectangular-shaped things.
posted on Nov 6, 2006 - View this thread

Imagining the Tenth Dimension (Flash). 10th dimensional physics and string theory don't get any easier than this.
posted on Jul 4, 2006 - View this thread

A small world in most dimensions: "University of Washington scientists using gravity measurements to hunt for evidence of dimensions in addition to those already known have found that those dimensions would have to occupy a space smaller than 0.2 millimeter."
posted on Mar 1, 2001 - View this thread