Wow, clearly a well written tool, it impresses with it's lightning response-times and slick interface. And best of all, I expect its tragic flaw can be fixed rather easily. Like others have said, its painfully difficult to skim the cramped summary text for each article. And the headlines (which is what 90% of people are going to skim anyway) don't pop. But I expect:
1) If the headline font size were boosted 2 or 3 points, and maybe emboldened, they would be much more readable without taking up much extra space.
2) A simple control were added that allowed you to widen the size of the tool (I happen to have a brand new 24" monitor, and I was dissapointed I couldn't use my desktop real-estate), that the tool's slightly claustrophobic feeling would vanish.