Easily create widgets for a variety of phone settings
Switchpro is a widget rather than an app, and it is a paid for one. However, it is very good at what it does and what it does is take the usual control features that a smartphone has and turn them up to eleven.
Unlike on board systems this is very customisable and lets users create new widgets for controlling their power features, or Wifi and bluetooth settings, and add new settings to them. The app is .61p, and if you have become frustrated with the available options on your current handset it is well worth it.
Android versions up to 3.0 are supported.