For breadth I like MetaFilter, a general community blog/aggregator with thousands of users. The sheer quantity means skipping most of the links and discussions on the site, but because there are so many posters there’s sometimes a domain expert or two participating in each of the threads I decide to read.
Your example Science News links are a bit like the articles that run in American Scientist (though some American Scientist articles are paywalled). MIT Technology Review isn’t bad either, and their culling of the best from the physics sections of the arXiv is nice, although I don’t know how much their coverage overlaps with Science News.
For breadth I like MetaFilter, a general community blog/aggregator with thousands of users. The sheer quantity means skipping most of the links and discussions on the site, but because there are so many posters there’s sometimes a domain expert or two participating in each of the threads I decide to read.