Did a search on the truning section of the woodnet.net forum on weeping willow:
"It is kind of stringy, but looks nice when turned. Very light weight, so if you turn a thick wall it still feels light. I have been told that you can use a cherry stain and it looks remarkably like cherry. Never tried that so cannot say. Worth turning in my opinion"
"Great thing to have this time of year, because it makes light ornaments even when hollowed fairly thick. Get dead/dry branches.
It's almost bulletproof to dry, so rough, realizing that it's going to be fuzzy when soft, store for a couple months, then check it out. Turns well, finishes pretty with the strange grain. The thick bark makes a very attractive "natural edge" piece, but fortify periodically while turning with thin CA and after, or some nimrod will pick it up by the bark and break it off.
Smells like the dungheap, so if you can turn the green stuff with open windows, I'd recommend it. "
"I milled and air dried some weeping willow several years back and it turns beautifully, a light tan colour that ages to a rich gold with redish overtones.
Extremely light and strong and as you turn you might see little feathers appearing but they are very thin and get turned through quickly"
Rich S.