Thanks to Digg, I've found a place to download the old Secret Life of Machines episodes: http://sciencezero.4hv.org/tslom.htm
This download appears legitimate because the Secret Life of Machines web site provides a direct link: http://www.secretlifeofmachines.com/dvds_and_videos.htm
For those not familiar with Secret Life of Machines, it's kind of like the BBC's version of the History Channel's Modern Marvels or the Discovery Channel's MythBusters made in the hosts' garages. I loved watching these when I was younger so these downloads provided the need to download and use BitTorrent.
If you've seen the show, you'll probably want to download them too!