I had some free time this weekend and I used it to create my second Google Gadget called called FeedBurner stats. (By the way my first gadget was Bloglines Notifier, which notifies the count of unread items in your Bloglines account). It uses FeedBurner Awareness API to fetch the subscriber count of your FeedBurner feed and displays it using Google Charts API.
The full source code of this gadget is available here and if you are interested you can add it to your Google personalised page by clicking this button.
After you add the gadget, you just need to enter your FeedBurner feed URL. The gadget will fetch the subscriber count for the past one week and will display it in a nice bar graph using Google Charts API.
The following are the API’s used for creating this gadget