[This video of a toy MegLev train][link] does a good job of explaining how the technology works. (via [kottke][source])
[link]: http://www.youtube.com/watch?v=5el1A5B-h3Q “YouTube – MagLev Toy Train ENGLISH VERSION”
[source]: http://www.kottke.org/09/06/maglev-toy-train “Kottke’s post about the video”