Usability 
MediaHackers.org is the latest implementation of Dave Winer "River of News" style RSS agregator. Mr. Winer, who created the RSS 0.92 and OPML formats, originally lauched his NY Times River a while ago. It's was a site that combined multiple NY Times RSS feeds into a single constantly updated page.
Media Hackers features multiple rivers each in its own tab. There are tabs for movie news, podcasts, tech news, the original New York Times River, Apple, world news and several others.
Media Hackers is fairly trim with a page weight of under 500 KB but, unlike the original Times River, it isn't really mobile formatted, at least in my Android phone's browser. The page is wider than the browser's viewport and tends to slip sideways when scrolling through the news.