We are working with a professional PR agency that is helping us coordinate media inquiries and putting out feelers through mass media wires (ex: Cision PR Newswire)
As a result of traffic, we did get a bump of visitors the day it was picked up on Yahoo, as well as us publicizing it through our social media.
Of course, news can get old in 2 seconds - so I recommend that if you do publish a mass campaign for your product, coordinate follow-up stories/interviews to get value from the press release. Tech/industry focused writers and freeelancers are looking for stuff to write about it, and your project could be picked up.