One thing I was working on during my internship at Google was a beautiful new look for Checkins. The extension I now made* takes map images shown in such Checkins and replaces them by an actual map which you can zoom and drag around!
This extension is a result of me playing around and experimenting with code hosting on Google Code (which is pretty nice!). The extension is extremely lightweight and easy to use. Just hover the Checkin Map and a real map will be shown.
The code is open source and available here: code.google.com/p/clickthrough-maps
To install the extension, please visit the Chrome Web Store: goo.gl/ETRHM
*Unfortunately, my internship is already over, so here's the usual disclaimer: this extension is not officially supported by Google and may break at any time.