Also, Google News. No idea what their algorithm is (most clicks, weighted with trustworthiness of site, but not always?), but they usually have a good range of coverage, and beyond the initial three articles in any given section, can actually provide really interesting articles.
Edit: Actually, and also HN.
It's not perfect and you do need to stay on top of things; I'm a heavy user of lists and persistent search tags. But you could also use a service like http://getlittlebird.com to find people in a specific field.
reddit.com/r/worldnews