Top 3 Apps for Android: Keep Track of Everything

Locale
$1 Locale lets you create location-based tasks. For example, you can have your phone turn on Wi-Fi when you get home, or have the phone silence itself when you get to work. It’s a great way to automate minor tasks, saving you a few extra minutes—and the embarrassment of having an overly noisy ringtone go off in the middle of a meeting. 

Springpad
Free Create notes and reminders about movies you’d like to see, books you’d like to buy, or just events you’d like to remember. Springpad is also great for putting together shopping lists: You can quickly create checklists and scan barcodes to keep track of items you’ll need in the future. (Also optimized for tablets.)

Wunderlist
Wunderlist syncs your to-do lists across all your devices, so you al­­ways have your tasks with you. Wunderlist will also email you when you are close to a deadline, in case you don’t check the app every day. (Also optimized for tablets.)