YouTwit
The Twitter service YouTwit is another app that puts Twitter updates on a Google Map. To use the service, you enter in a Twitter ID and you’ll then see the location of those updates on the map. Locations appear to be determined by the place the person said when they registered instead of being real-time geo-positioned updates.
Twittercal
TwittercaI is a free service that connects your Twitter account to your Google Calendar. Using the Twittercal service, you can easily add events to your calendar, just by using Twitter. Using Twittercal is simple: just add gcal as your friend and grant it access to your Google Calendar account. You can begin using it right away just by sending a direct message to gcal. Example: d gcal meeting tomorrow at 2 PM.