For someone in my position (Product Management), a news aggregator is more than interesting - its an absolute necessity. For instance - the only reason I found a reference to a BitWise Magazine article on Smalltalk is a BlogPulse RSS search for references to "Cincom Smalltalk". I have similar searches set up using Feedster, PubSub, and Google. I track references to VisualWorks, ObjectStudio, Smalltalk, "Cincom Smalltalk", and our Smalltalk competition. I also look for references to myself and to BottomFeeder.

There's simply no way that I'd have the time or patience to follow that many bookmarks in a browser. It doesn't catch everything, to be sure - there's no substitute for communicating with your customers and prospects. But it's a highly useful piece of the puzzle.