This article on common static stretching mistakes is worth every word!
Eric Cressey is one of the best resources out there on . . . well, on just about everything.
This was Snooped off of a Facebook page page. Thank goodness she posted it – it is a wealth of usefulness!
(If the link doesn't work, here's the URL: http://www.ericcressey.com/15-static-stretching-mistakes)