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Gowalla Friends is a Chrome Extension that displays your friends recent checkin’s. The source code is open source and available for all. It is a simple extension that parses an rss feed but shows off several features of writing an extension including desktop notifications, storing items in localStorage, showing badge count, having code run in the background and displaying a popup when clicking on the extension icon.

The extension was done for fun as an excuse to learn the chrome extension api and publish an extension. So feel free to grab the source and I hope it helps you in creating your own Chrome Extensions.