Location Switch is an Automator action that adds some painfully missing features to Mac OS X's built-in Locations option (y'know, that feature you never touch in the Apple menu?). Location Switch can a whole host of application preferences and settings based on which location you chose, such as sound volume, SMTP servers, default printer, etc. Before you use it, however, the action requires some customization on your part, so check out the accompanying ReadMe file for instructions, and open the action in Automator to give it your personal touch.
Location Switch is available free from Automator World, but if you enjoy it, consider sending its creator, Charles Schoenfeld, a donation at his site.
[via Hawk Wings]