In the development (4.2 build stream) build of BottomFeeder, I've just added support for a new feature - search feeds now support Newspaper mode. What does that mean? Well, a search feed is simply a pseudo-feed built from a search across all your subscriptions. So say you want to track commentary on the Vista delay - you open the search dialog:

Now, having defined it, I get a view like this:

Toggling properties to set newspaper mode on, I get:

Which gives me a "River of News" kind of view on the search term. You can set those up as regex searches as well - but you'll need the latest 4.2 based update