This isn't exactly what you are asking for, but perhaps it's a starting point: I keep my bundled RSS subscriptions at http://www.gwern.net/docs/gwern-google-reader-subscriptions.xml
(Note that it's quite a lot of stuff, and you will want to prune heavily.)
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I sometimes enjoy investigative reporting and news analysis published at some of the leading 'zines: The Economist, The Atlantic, Wired, Businessweek, Salon, The New Yorker. (Note: I never check these sites; I just occasionally click through from other, more selective sources.)
But I don't read enough stories to have found any that I'm confident are consistently driven by genuine curiosity. Imagine a webzine where stories are researched by a horde of gwern uploads and written by a horde Yvain uploads.
Can LWers recommend any consistently curious webzines/magazines, or at least some consistently curious authors?
For example: Glenn Greenwald shows some promise, but I haven't had time to investigate. How about Seymour Hersh? Greg Palast? TruthOut? FAIR?