I like this article by Andy DuBois...probably because it jives with my experience:
One interesting side note; I've achieved more permanent and effective improvements in mobility through resistance training than through any other activity...including stretching. This article from Sports Injury Bulletin suggests I might not be the only one with this sort of experience.
In the meantime, I like to keep stretching to a minimum...and do it primarily at the end of a workout...or the end of the day. If anyone would like to share their experiences, just comment away.
PS Here's a good video demonstrating 4 effective and simple post-run yoga stretches ...recommended by Ben in his comment below. It's done by Ben's wife...Mary Catherine Starr. Thanks to Mary Catherine.