Lots of videos from CES 2010 about Home Networking technologies.
HD-PLCs video includes the demo, but not much of a booth tour.
Their 2009 video is much shorted and certainly more sweeter.
HomePlug's CES video is a bit over produced (but when you have tons of members, you can adored it) and happily the video is half as long's as HD-PLC's, but has no show girls.
IOGEAR Wireless HD USB Audio Video was short, but only a tour of the booth.
DS2/HomeGrid had a nice (i.e. short) demo of their G.hn prototype. Not sure why the fans were so noisy or why nothing was plugged into the power-strip.