Just a few more days... Until then, here's one of my favorites: Lie on your back, preferably with some kind of lumbar support to maintain your lordotic arch. Pull one knee to your chest without allowing your hips to rotate AT ALL. Hang out with the knee to your chest for a little while, fighting that pelvic rotation. Once you've loosened up a bit in that position, begin trying to straighten that leg without changing your knee and pelvis positions -- you may not be able to straighten it very much at all, but that's fine. Hold that, making sure that pelvis is static, for 20-60 seconds.
I've found this to be one of the best ways to make sure my clients are not absorbing some of the stretch with their lower backs and actually stretching the hamstrings. It also seems to hit the lateral part of the leg a little better, which tends to not receive as much of a stretch in other positions. Thanks to Kelly Starrett of San Francisco CrossFit
, the best PT EVER, for introducing me to that one.