Loominous shows forthcoming events from iCal in your menu bar or in a floating window. Events 'loom', becoming darker and more noticeable as they get closer.
All day events are treated as reminders. They are shown as little blobs on the display. Click the dock icon or the menu bar display to tick them off and hide the blobs.
Clicking on the dock icon shows the same information about forthcoming events in the middle of your screen.
Loominous requires Mac OS X 10.5 Leopard.