This is both a sample App and one of the entries at MobileDevCamp NYC.
You will need to get an API key from Groupon their developer site here.
After getting your API key add it to the config.js in Resources.
Stuff our legal folk make us say:
Appcelerator, Appcelerator Titanium and associated marks and logos are trademarks of Appcelerator, Inc.
Titanium is Copyright (c) 2009-2010 by Appcelerator, Inc. All Rights Reserved.
Titanium is licensed under the Apache Public License (Version 2). Please see the LICENSE file for the full license.