Google Labs, the new feature playground, has added some calendar options that might help you get a handle on your day:
I’m testing the following 2 features that offer a quick “Heads Up” view of your calendar information.
1) Next meeting: This feature adds a box to the right side of your calendar that boldly states “Next meeting in XX Mins, Sec”. Nice!
2) Free or busy: This adds a box to the right sidebar that allows you to see your colleges google calendar current status as Free / Busy (requires that friends share their Google Calendars with you. How to share a calendar)