If there is a toy Allie, Anna and Emily have played with a lot, I would have to say their Fisher Price Little People is at the top of the list. We have gotten so much mileage out of those little figurines! (I now have the LP theme song by Aaron Neville in my head, thank you.) In addition to the standard LP house, barn, and airport, the girls have been gifted a Thanksgiving set and LP nativity set as well. I'm pretty sure they have one of each of the LP characters, including three Sonya Lee figurines.
When I saw the girls line up their Little People figures to meet the Beauty and The Beast characters it was purely awesome. I grabbed my FLIP video: