I'm planning on using Baby Connect (http://www.baby-connect.com/ )
A friend of my pretty much swears by it and knows me well enough to think I'd love it as well.
You can have the mobile app, which it's geared for, but you can even log-in online. They even have it for android.
you can do all of the following: (copied from their website:)
Solid food tracker
Activity, Milestone, photo, mood, location tracker
Emails and Export
Facebook, Twitter and Text Messages
ETA: You can also have multiple kids on your account, so its not just for newborns or babies, you can always have your older kids information at hand in case you want to compare your first childs feedings with your 5th childs, etc.
Another Edit: It was once free...now it's like $5. I'd say it'd be worth it if you are planning on staying with your Iphone for a long time, but if you switch phones often....maybe not.....