Extremely interesting ideas on "River of Search". The idea being that you set up the equivalent of "Google News" but focused on your own industry or company. I think there's going to be a lot of interest in this.
Also, until more people figure it out, a potential value add service to provide to clients for small businesses. Hi, Mr. Small Business Owner, I've set up a webpage that will show you news on "shoestores" or "cement mixing" in both blogs and mainstream media.

Unrelated: Arbitrage in Advertising-Related Search.