It can get frustrating to switch from a regular call to speakerphone when you're in a hurry. The speakerphone button tends to be small and surrounded by many others, and it requires attention to press; something that can be difficult while driving or multitasking.
For those of us in a hurry, there's an app for that.
Auto Speaker monitors the proximity sensor during a call, and when the proximity sensor detects that the phone is away from your face, speaker mode automatically becomes enabled, without having to press anything.
You can change the sensitivity options so that the application won't turn on sporadically. Once the options have been tweaked, you can toggle the application on/off from a simple widget. Auto Speaker runs during the dialer application, but does not change it at all.
It's the perfect app for staying connected, and it's free. What could be better?