Here’s a great little application that I’ve used over the years which now has iCal integration. Quick access to all your events and to-do items right in the menu bar. Very easy to use, intuitive interface and small process load. The iCal integration is very well done and features several different ways to view your calendar information. I highly recommend you surf on over the Objective Park Software and give MenuCalendarClock a try.
Free version as well as a option to register for $19.00 to unlock additional features. There is a reminder popup for using the advanced features.