This is primarily an academic research tool (recommended by Dave MacCourt at the UMass Library.) Since it works with multiple sources outside acedemia (including wikkis) it would be a great way to organize sources for news/magazine articles.
The Writers Guild of America, East, (WGAE) is a labor union of thousands of professionals who are the primary creators of what is seen or heard on television and film in the U.S., as well as the writers of a growing portion of original digital media content.
.After the Deadline is a language checker for the web with: We use artificial intelligence and natural language processing technology to find your writing errors and offer smart suggestions. Our technology is available under the GNU General Public License. We run an After the Deadline server for your personal use.
If you're writing for a newspaper, the majority of them are fussy about following the AP stylebook. It makes sense from their perspective. They have a deadline and don't want to worry about details. Like this example from my hardcopy version of The AP Stylebook "Initials … T.S. Eliot (No space between T. and S. to prevent them from being placed on two lines of type." (P 363) I bet the online version is easier to search and the auto updates would be nice.
http://www.snopes.com We all know about Snopes, But while I was checking other sites I came across FactCheck.org. I saw the .org and thought 'probably reliable.' Turned out to be a conservative propaganda spin page.