Well, yeah, I guess posting to as many places as possible is one way to go, but apart from HN, do you suggest any other extremely cool, heavily hyped, news sites, mailing lists, and the such? :)
Then when you release, you're just letting people know that there's a better way to do things.
Other alternatives are places like techcrunch ; there you must be one in the circle or getting a funding scoop. Or at best they will write in an effort to bury you instead. :-)