A Nice bit 'a UI Innovation

DateLens is a piece of Calendar Software with a very interesting focus + context, zoomable user-interface (Details and flash-based demo).

The basic view is a grid, with each cell representing a day. You can zoom in on a particular day, whereby that cell will enlarge and, to give it more space, the surrounding cells will contract a little. The zooming is smooth and works in a progressive fashion: you can go from a small cell for the day, to a summarised view, to the full details. I haven’t tried it myself, but the interface looks quite natural and flowing.