Some additional links

Acoustical Society of America
133rd Meeting Lay Language Papers (early HSS paper, '97)
http://www.acoustics.org/press/133rd/2pea.html

Polymer films tapped as potential subs for speakers

http://www.eetimes.com/issue/tech/OEG20030721S0061

Noisy Dispute Erupts Over Audio Technology

http://www.techweb.com/wire/story/TWB20000905S0008

"The dispute stems from student Joseph Pompei's accusation that Sennheiser Electronics GmbH, Berlin, founded by Jorg Sennheiser, a professor at the University of Hannover, used technology that Pompei had demonstrated a year before. The company denies Pompei's charge"

(note, the point is moot, Woody Norris preceeded them in '96 and there is prior art to that, anyone can make an acoustic heterodyne, how you it is another story - sorry if you all know this, a lot of people don't)

Sony selling the first units

This appears to be the HSS II model, make sure you get HSS III if you are buying one, try ATC direct, it may be cheaper.

http://www.creativevideo.co.uk/gimme/storereframe.php?view=item&item=sony_hss-r220b

Woodynorris.com personal web site. There are many articles and inventions, magazines and newspapers. See the Wall Street Journal from April 2004

http://woodynorris.com/Media.htm See the April Wall Street Journal article

NY Times The Sound of things to come March 2003

http://www.datafilter.com/mc/nyTimesHssInfoMar03.html

From "The Engineer"
Direct hits Advertising industry, see HSS

http://www.e4engineering.com/story.aspx?uid=83fdb702-256e-4f71-a3f2-318a506eb781

The ATC Government technology section

http://atcsd.com/gov_tech_port.html

There is a new device I don't know the specifics of, the 5MC system for Aircraft Carrier flight decks. What I know is it is some kind of directional emitters pointed to section after section of the flight deck mer emitter. The volume for each emitter is self regulated by measuring the ambient noise level and adjusting accordingly.