Here's my latest blog post... I'm saying 'post' instead of 'article' because this is more of a showcase than a tutorial. Code is provided as usual so the learning process is on your side at your will and your pace :)
What the screensaver actually dipslays is shown above (Earth plugin required). The screensaver is continually fetching the latest North American Tweets containing the #Google Hashtag from Twitter and displays them. Pretty nice!