Some people think that having an app that knows SO MUCH about you and tracks everything you do is creepy, but I find it incredibly helpful, because it follows this simple formula:
Google's unlimited knowledge about current events
+ data collected about you
= helpful tips, reminders, warnings that you would never learn about on your own.
With just one click I can share anything (pictures, links, files, lists) from one device to all others - saves a ton of time since I used to open up my email and compose a message to myself every time I needed to do that!
If you're big on podcasts (like myself) then this one is a MUST. They have the biggest podcast collection and you can keep all your subscriptions in just one app - definitely de-cluttered my phone and... my mind!
Nutrition Logging App
This one is still a dream for me. There are quite a few apps that track your caloric intake, yet the ones that can also track your vitamins and minerals intake on the go are virtually non-existent. Even the ones that do claim to do just that are usually either buggy (ex: Cron-O-Meter) or too user-unfriendly and limited (ex: Nutrition DIARY):-(
What are your favorite apps that you use on a regular basis? I'm always looking for more cool helpful ones!;-)