Ok, it's not really a quilt, but it's still damn neat. I'm also relatively certain it's been circulating around the message baords this week, so there's a good chance you may have seen it. If not, though, it is worth a look: ZOOMQUILT.
To zoom on it, hold your mouse button and move your mouse up to zoom in, or down to move out. Zoom over different portions of the images. Somebody had a lot of free time, and the results of it are pretty spiffy!