1. What to Expect app
This app was great throughout my pregnancy to see what I could anticipate each week and what was going on inside my belly; when you register, the app automatically puts you in a community group/message board with other members due the same month as you. People can post questions and responses in your month's message board, which saved me from asking my OB/GYN a lot of dumb questions.
The message board continues after the baby's born and is a great resource for questions on baby milestones, feeding schedules, sleep routines, etc. There are other message boards for breastfeeding, pumping, and working moms. I always read through the posts during middle-of-the-night feedings (since it's just about the only thing that's updated 24 hours a day!)
2. Baby Connect app
I do not know what I would do without this app - I love it. You can use it to log pretty much anything baby-related -- feedings, diapers, vaccines, doctor's visits, height, weight, and head circumference measurements, medicine, pumping, milestones, etc. I use the timer function to log how long my son nurses on each side (as well as keep track of which side I started on the last time). I also use it to log how many ounces I pump, which helps me to see trends in my milk supply and make sure it's not dropping.
This app is critical for visits to the pediatrician, when they ask questions like how many times a day the baby eats, or how many wet and/or dirty diapers he has....the app summarizes all of these things for me so in my sleep-deprived state I don't have to venture a guess (because who really remembers these things?) We have this app on my iPhone and iPad, and you can also log in via the web. This app is TOTALLY worth the $4.99 price (which is saying a lot, because I usually refuse to pay for apps).
3. Kelly Mom (www.kellymom.com)
4. Meal Baby (www.mealbaby.com)
What websites or apps do you find helpful??