Really, I have a bunch of them, but as it pertains to fitness... http://www.active.com/ has so many fun articles. And I actually don't even go to their website that often, I just liked them on Facebook. They have so many interesting articles and lots of good informatiom about working out, running, nutrition, etc. I hope that I can be this informative as I develop this blog.
Some articles of note:
Race Day Guide
You Really Can Eat
Just search for active on Facebook and like them. You'll get tons of great articles.