Google Calender has tons of features that make it easy to stay organized, and one of my fave tools is the daily agenda email.
To get your daily agenda, just go into your GCal and look in the left margin for My Calendars. Click the down-arrow button and then click Notifications. Check off the "email" button next to Daily Agenda. Click save and you're all set.
The daily agenda emails will hit your inbox each day at 5 a.m., so even if you forget to open up your calendar that day, you'll still know what's going on. And you can get separate agendas if you have different Google calenders for different groups.