My Boppy pillow has gotten a lot of use with my two children.  They are great when the babies are little because it helps support them while I'm nursing.  This helps reduce back pain a lot.  They are flexible so they fit around any sized person and work well in the rocking chair.

As the baby grows and is learning to sit the Boppy works great as a support pillow to put around the baby.  When they fall over the pillow is there to break the fall! 

I also love that you can change the covers.  This was great since my first was a boy and second was a girl.  The covers are also a great way...