All credit for this link should go to TailChaser who brought it to my attention!
It's a youtube routine by a yoga instructor called Adrienne (she has lots of other videos too). The reason I like this one so much is because it's fairly straightforward for a yoga novice like myself, but it has all the stretches I want post run and it doesn't take forever. Doing this routine leaves me feeling not just stretched, but wonderfully relaxed too.
Thought I'd post the link in case anyone else might enjoy it