Windows only: Freeware program Calgoo offers desktop integration with your Google Calendar, meaning, most significantly, that you don't need to be online to view or schedule upcoming events.
Once you do go online, Calgoo will synchronize your Google Calendar with Calgoo so that you're always synced up and ready to go. Although I love the idea of Calgoo, especially for Gcal lovers who aren't always plugged into the 'netters, I wasn't thrilled with the trouble I had getting Calgoo going. For some reason the calendar would not show up - I was able to create new appointments and sync them with my Google Calendar, but I could never actually look at the main calendar. That said, if the calendar had shown up, I think I would have really liked Calgoo.
