I'm really trying to start a new habit of not wearing shoes into the house.
This article really brings it home why.
90% of shoes have some form of E. Coli on the bottom of them. And when you walk in the door... you are bringing it into your home. To be on your floor, chair, sofa, play area, counters... and then into your food.
And don't just stop with shoes. Book bags, purses, etc... it should ALL stay by the door.