Baby Care - track baby growth! This is an app to have if you're having a baby soon or already have one. You can do quite a bit with this app, from keeping a daily journal to tracking growth and everything in between. Great information at your fingertips as well.
Menstrual Calendar For the women out there, this is a helpful menstrual tracking calendar. Great if you're trying to get pregnant, or you just want to keep track.
My Pregnancy Today An awesome app for keeping informed about your upcoming child birth. There are terrific videos covering everything from your baby's growth inside the womb to actual child birth. The day by day tips are really great.
BabyBump Pregnancy Pro A pregnancy tracker that does it all! Love the forums with other moms from around the world along with all the great articles and tools available. It even has a baby names database!
Pregnancy Tracker You've probably read the book What to Expect When You're Expecting, so here's the companion app! Doesn't cover a whole lot that isn't also in the book, but it's handy to have on the go.