This is a $1 app in the android market that lets you form location-based missions. For instance, you can have your android phone's Wi-Fi turn on when you arrive at home, or have the cellphone quiets itself once you arrive at your work place. The app provides a great way to automate slight tasks, affording you a few extra battery time and the discomfiture of having an exaggeratedly noisy ringtone start out in the middle of a meeting.
Wunderlist is a freeapp in the android market that syncs your to-do lists in all your devices, which means you'll always have your errands with you. You'll also be sent regular emails by Wunderlist when you are close to a cut-off date, these applies to those who don't check the app often.(It's also optimized for android tablets).
Springpad is also a freeandroid app that creates reminders and notes about books you'd like to buy, movies you'd like to watch or just various events you'd like to remember. Springpad puts together your shopping lists while you quickly build checklists and examine barcodes to keep tabs of items you'll want in the future.
Minecraft Pocket Edition
This is a $7 app that lets you kill time on the go; Minecraft Pocket Edition is a very wanting game to play. Even though the app doesn't include the Survival Mode that runs in the desktop version, its Create Mode allows you to mine and construct to your heart's content (optimized for android tablets).
This is a $3app and one of the top-looking racing games offered for android cellphones, and it runs dozens of courses to pick from, some are hidden shortcuts (an added advantage if you're familiar with them). Then, after you've broaden your skills, you can compete with friends and strangers to an online multiplayer contest and check out who's really is the top reckless racer.
StumbleUpon is another free app that allows you "channel surf" the Web to locate things that are significant to your likes. Listing the topics that interest you, StumbleUpon app will recommend sites to match your list. With Android powered devices, the app will even suggest other apps that are already installed in your android phone (also optimized for tablets).