Christina Laun at the Virtual Hosting Blog comes up with 50 ways to get the most out of Google Calendar. Some are quite interesting:

Much like Gmail, Google Reader and Google’s other products, Google Calendar is fast becoming the application of choice for users all over the world. With great functionality and integration with Google’s other products it’s no wonder its popularity is growing. But chances are good that you’re not maxing out all the features of Google Calendar that you could be. Here are a few ways you can try to add to your Google Calendar experience.

6. View the weather. You can see if your weekly events will sync up with the weather or if you’ll need to bring an extra umbrella by integrating the weather report right into your calendar. Go to Settings and General, enter your location and whether you want degrees in Celsius or Fahrenheit, and you’ll have the weather right at your fingertips.

13. Colorize Saturday and Sunday: Make it easy to differentiate your weekends from your weekdays with this simple script. It will cause Saturday and Sunday to appear a different color on your calendar, preventing any scheduling mishaps.

28. Firefox Full Cal: Small screens can make reading the fine print on your calendar difficult. Expand the screen real estate of your calendar with Full Cal, which eliminates the list of calendars, the mini calendar, the search box, and other stuff that takes up calendar space.

And my personal favorite (#44): Use SyncMyCal to force Apple's iPhone Calendar to sync properly with Google Calendar through Microsoft Outlook.

Should be something there for everybody regardless.