that's what i've got this summer. her name is grace, and she lives up to it. for 2 hours on thursday afternoons, i can cook, clean or *gasp* read without interruption. the girls are in heaven; they worship grace. (in fact, today thing one said, "it doesn't seem like grace is here for 2 hours because we have so much fun - it seems like it's hardly even one hour!)
and here's a key difference between an 11-year-old baby sitter and a 44-year-old matron: the 11-year-old will suggest playing freeze tag.