wifi

http://geektechnique.org/projectlab/781/slurpr-the-mother-of-all-wardrive-boxes Homemade project to leech from multiple open wireless networks for a faster connection.

Gil's LotD
http://wificamera.propositions.org.uk/ A cool project that consists of a homemade cantenna and a projector which projects the wireless networks as they are observed by the antenna.
http://www.youtube.com/watch?v=pv5zWaTEVkI Another home music video by the band OK Go.
http://www.youtube.com/watch?v=DjCL0_0Il7w The same music video, done with legos.

http://video.google.com/videoplay?docid=-1021256519470427962# Cracking a WEP protected network quickly on a Mac.
http://www.madehow.com/ An explanation about how pretty much everything is made.

Gil's LotD
http://slate.msn.com/id/2109941/fr/rss A guide on stealing WiFi access.

Gil's LotD
http://www.awolusa.com/ The AWOL is a device that lets you get drunk without drinking by using an alcohol vaporizer.
http://www.newscientist.com/news/news.jsp?id=ns99996240 Wallpaper has been invented that blocks wireless internet signals.