Google recently released a very cool syncing solution between some of their Google Apps and many mobile phones. If enabled on your mobile device, it allows for two-way syncing between Google Calendar and Google Contacts. So your calendar and contacts are always up to date regardless of whether you updated them on your mobile device or via a web browser on your computer.
I synced my calendar up with my iPhone in just a few easy steps. They also offer instructions for configuring other mobile devices as well. This is really useful and easy to use, check it out.
