One of the apps that I have had on my G1 for the longest time is Locale by two forty four a.m.. It’s a really nice utility that lets you customize your phone based on certain dynamic situations. It’s really easy to do.
First you add a new Situation and give it a name, then you add at least one Condition. You can see the list of Conditions in the screenshot above. Then you select what Settings you’d like to have changed when that Condition is met. All of the Situations I have set up are based on time, but you could specify something to happen based on Location. For instance, when the phone is 100’ or more from your home address (using the phone’s GPS to pinpoint your location), you could have it turn off your wi-fi to save battery. Or when the battery drops below 20%, you could set the screen brightness to 10%.
Like I said, all of mine are simply time-based. The Situation named “Quiet Time” has the Condition of 11PM - 7AM, and the Setting is to turn the Ring Volume down to it’s lowest audible setting. The other Situations I created just change the wallpaper at certain times throughout the day. It’s very basic, but it adds a bit of fun customization to the phone.
As with most Android apps, just go to the Android Market on your phone and search for Locale, or you can visit the Twofortyfouram website for more information.