DS (23mnths) watches TV while I clean and cook, because otherwise he tends to do naaughty things while I am out of the room, or hang off my legs while I am trying to open the oven etc.
I am trying to find things other than tv watching for him to do though, as I tend to spend about 2 - 2.5 hours a day cleaning or cooking, and I think this is a bit too much tv for him. Also it means I feel guilty about letting him watch a bit when he is wound up or tired as I think he has had too much already.
What do your kids do when you need them to not be by you??