This one’s pretty awesome. Using this tool, you can create Google Calendar Events by twittering. Just follow gcal and direct message an appointment to gcal and the event will show up on your calendar.

Currently I use Google Sync to connect my Outlook Exchange calendar with my Google calendar. This way my wife can access my work calendar and create appointments without her having access to Exchange. Now I can twitter an appointment and it will sync to my Outlook Exchange calendar. This is especially nice for a guy who doesn’t have a data plan on his phone. I can text to twitter and set up meetings.

Go here to check it out.