Trail Runner
www.trailrunnermag.com
This site is an extension of the print magazine Trail Runner. The purpose of this site is mainly to interest the viewer in purchasing a subscription to the magazine. I couldn't find any credentials for the writers on the site. One would probably have to go to the magazine to find that.
As far as content goes this site seems much more informal than others, which I found drew me in more. There are many great training tips and articles on running locations and nutrition. The only thing I found different on this site than other running sites was its focus on trail running only.
The site is updated monthly to coincide with a new issue of the print magazine. It offers many archived articles from past issues. Much of the site's articles are only teasers which entice the reader to purchase the magazine. It has a whole section of links that go to the websites of sponsors of the Trail Runner site.
The design of the site makes it seem like one big advertisement for the magazine, but what little running information you can get is accurate. The credibility of this site can easily be called into question, but one mest realize that its main objective is to convince the reader to buy the print magazine.