I keep running across cool and useful JavaScripts that emulate Apple's zoom boxes, which it uses for adding detail about products or showing larger versions of thumbnails. This is a new one to me. It doesn't have the nice rounded corners of Apple's but does have some features my other fave lacks.

Speaking of which, the script I've been using lately is FancyZoom... the variant that works with Prototype and jQuery and doesn't pull images in using Ajax. The original version of FancyZoom is also cool, more like Fancy Box.