Zoomooz is a cool js jQuery plugin you can create very impressive zoom effects on your whole page.
You can scale, rotate or skew (!) your page to achieve wonderful effects… there are 3 samples: I like “flickr image stack” and the “svg tree demo“.
And it’s amazing to see what people did from this… a few examples (sites using it and crazy people creating even more crazy libs based on this)…
UPDATE: browsing around I found this awesome site too..