As you probably saw, or will see shortly, I'm keeping this down in my sig. Not because I'm so presumptuous to think that I'm some sort of authority on legitimate sources, I'm just using this to put up a list of reliable sources, and what categories they're under. If you want to suggest new books/magazines/websites whatever to put on the list, just send me a pm of their names, what they pertain too (if it's not painfully obvious), and a sentence or two on why they're good. Feel free to do this if you feel a source should be removed from the list. Even recommend entire new categories!
And so, without further to do:
A Guide to Good Sources:

Daily News:
http://www.boston.com/bostonglobe/
http://online.wsj.com/home-page

Public opinion/polling:
http://www.gallup.com/Home.aspx

Policy/current event analysis:
The Economist magazine
http://www.economist.com/
Foreign Affairs magazine
http://www.foreignaffairs.com/
American Journal of Political Science
http://www.ajps.org/
The Christian Science Monitor
http://www.csmonitor.com/

History:
A World Lit Only By Fire
Life of an American Slave
1776
Shelby Foote's 3 part Civil War Series
Rise to Globalism
A Soldier of the Great War
Helmet for My Pillow
A Rumor of War

Economics:
Essential Economics
Failure of the New Economics
The World is Flat