Retro Thing, one of my favorite blogs, points out this clever hack. The iPod nano is great, but that screen is a little small for watching movies. How do you solve that problem? Well, if you have some time, a 35mm slider viewer, and some small speakers you can hack together a solution (as seen in the video).
The movie looks pretty good, though this solution does make the iPod just a little less portable. That's the great thing about hacks, though, they don't need to be practical to be awesome.