I skip stretching. Guilty as charged. When I get back from a run the last thing I want to do is spend any more time in sweaty stinky clothes than I have to. Plus, there's usually a baby that needs changing or feeding and dogs that need letting out. In short, I have shit to do and can't be bothered.
Those are some pretty lame excuses considering a more religious stretching regimen could have saved me a lot of pain and frustration as I do battle with my natural bio-mechanics.
One of my former students sent me this video for a 10-minute yoga-based post-run stretching routine. I feel great after taking the time to do this and experience much less residual soreness later in the day. Take an extra 10 minutes to stretch, it's completely worth it.