Today on engadget I found a project for the iOS devices (http://www.engadget.com/2010/09/22/iphone-awareness-app-selectively-filters-outside-noises-into-yo/) that closely mirrored my project (http://shriphani.com/blog/listener). The app seems to do a bit more than mine does. First, I do not send the sounds back to the user through the headphones while this does. They probably use a better voice activity detection algorithm than I do and so on.
And of course, more people (millions) know about that app than about mine (about 20). Hmm no fair.