I had a couple of cuttings to take (it being that time of year), but wasn't keen to get commercial rooting hormone to help them along. Someone at the EAT 2011 course in August told me that you can use willow bark as a rooting tonic, which makes a lot of sense given the notorious enthusiasm with which willow will root.
With reference to instructions for herbal decoctions and instructions for willow rooting tonic, I went for the most straightforward option: a fresh willow twig from the tree opposite the house, broken into 2" chunks, put in a bowl, covered with boiling water, and left overnight. Initially there seemed to be no change in the water and I was a little dubious as to whether this would work. By the next day it had definitely taken something from the willow, and changed colour.
The cuttings in question are rosemary and thyme. I want backups of my current plants, as I plan to move the grown-up plants out of their pots and into the ground next to the (rapidly-growing) lawn. My concern is that the soil there is very clay, and lacks good drainage — not great conditions for herbs. In mitigation, I plan to dig a big hole and fill it up with a combination of garden compost, two-year-old potting compost (since herbs don't like a soil that's too rich), and a little sand to improve the drainage, before transplanting. But there's definitely still a risk that the plants won't survive. Hopefully if that happens, at least one of the cuttings will do and can be nursed up to replace the plan.
I took twig cuttings as usual from both plants, cutting diagonally across the stalk and stripping the leaves from the bottom half so they won't rot in the soil. I then dipped them in the willow bark infusion before putting them in the compost, and for good measure, watered afterwards with a little of the infusion as well. Now they're with the other potted herbs on the back patio, and I'll see if they make it to next spring. (Green) thumbs crossed!