I've worn a pedometer everyday for over two years now. I've been getting 10,000 steps a day everyday since then (with the exception of one day when I was sick last year). So you can imagine the panic I felt when I noticed my pedometer was missing!
A while ago, I was writing about possibly giving up the pedometer, but I never did. There were so many challenges that required one, that it's gotten to be such a habit to wear it. Plus, I think it motivates me to make sure I'm moving enough.