Tweets on a
plane calendar! What's not to love? And since every Tweet has a timestamp, it should be pretty easy to feed that data into a Google Calendar (in fact, it's been done). And it's interesting to look at how my patterns have changed since I started using Twitter.
Now this is the kind of thing that Yahoo Pipes is great at—taking data from one service and reshaping it to fit somewhere else. Now if you're a prolific Twitterer, it can take some time to process all that data, so enter your username (no authentication required—this won't work if your updates are private!) below, and start the process. It will be one click to start importing your Tweets into your Google Calendar (note: it may take a few minutes to render all your data. Only works on your last 3,200 updates.). This is set-and-forget, so once you've subscribed, your calendar will update automatically.
The JSON can be saved to your hard drive as text if you'd like the peace of mind of knowing that your data doesn't live in one spot. Since Yahoo Pipes powers this, you can see how everything works—here's the Pipe that does the magic of spinning updates into events. Once it was built, it was pretty easy to modify it to output the important data in JSON, which is essentially data you can download and squirrel away for safekeeping (Pipes doesn't output plain XML). If you have any questions or strangeness to report, let me know in the comments.