This page will be a compilation of performance-boosting articles that caught my eye. I highly recommend subscribing to Running Times. It's an exponentially better publication than Runner's World, and only costs $20 a year on Amazon. Nearly all these articles are from Running Times. Look through these and then definitely explore their site on your own.
How to cool down properly: http://runningtimes.com/Article.aspx?ArticleID=20755&PageNum=2
How to reduce injury with quick, but effective warm up and cool down strengthening routines: http://runningtimes.com/Article.aspx?ArticleID=23764
How much and what kind of protein should you eat?: http://runningtimes.com/Article.aspx?ArticleID=24171&PageNum=1
Gain five pounds and run better: http://runningtimes.com/Article.aspx?ArticleID=24224&PageNum=1
How to eat on race day: http://runningtimes.com/Article.aspx?ArticleID=24906
How to fix form flaws: http://runningtimes.com/Article.aspx?ArticleID=23920&PageNum=1