When you have a baby, it can be helpful to keep track of their feedings, sleep habits, and diapers. BabyConnect is an extremely useful website and mobile app that allows you to track all of these things and more (pumping, medicines, doctor visits, weight, etc). It also has useful charts and graphs, and can be accessed by other members of the family and caregivers. You can enter data via the website, your phone, or iPad/iPod.
Is your home or work office too quiet? Do you work better with the coffee shop ambience, but want to stay home? This website has several background soundtracks you can play while you work, such as a coffee shop, lunchtime restaurant, and university cafe. You can also install the Android/iPhone or Mac app for quicker access.
The great thing about Android phones is that you can customize so much of how they work: the keyboard, home screen widgets, and even the text messaging interface. Here are some of my favorite apps for customizing Android:
ADW Launcher (customize the look of almost everything on your phone)