In a standard demonstration of the latter a cylindrical magnet is dropped down an alu tube where it comes to a virtual stop while neither significant mechanical losses are involved nor magnetization of the tube.
Hadn't heard of that before.
I found this video:
http://www.youtube.com/watch?v=nrw-i5Ku0mI
An even better one:
http://www.youtube.com/watch?v=30oPZO_z7-4