Mosaic

This was discussed on diggnation this week (which I'd also recommend.

This online mosaic application let's you drill down infinetly into more and more mosaics. Very cool.

Just click somewhere on the initial image and you'll zoom in - continue clicking and you'll zoom in more and more - each time finding that what was once a tiny portion of the original picture, is itself made up of other tiny pictures - and so on and so forth.

Give it a try, you'll like it.