Most are in totes on the floor next to my cutting table - I'm working on four samplers at the same time right now. Don't have to worry about needle position as they are being sewn on my straight stitch machine.
I have several long term UFO's in totes in my stash closet. I don't worry too much about them as if they are in there, I might never get back to them. Quite a few of my ufo's are block sets too - way too many of them!