Launched in April, Google Calendar quickly became a staple of the search giant's Web tools. Unlike most computer-based calendar programs, Google's is stored online rather than on the user's own machine. That means you can log in with your Gmail account name to create events, then see what's next on your schedule from work or home — indeed, from almost any computer with an Internet connection. You can even receive updates to your mobile phone through text messages. To make things more fun, you can share your calendar with others or search through public events.