Have you looked the blogs of academics? I find that many law professors blog about topics based on intellectual interest, rather than partisan axe grinding (but it depends a lot on the site).
Sentencing law
Random law
Orin Kerr and (sometimes) Eugene Volokh at Volokh's blog
Of course, I'm a lawyer, so these may be inherently more interesting to me than to others.
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?