HighSlide isn’t limited to images. You can implement the same zoom and enlarge effect to display texts, flash content, iframe content and so on. You will find lots of demo on the site.
An example pop-up text box
HighSlide is also available as a plugin for Wordpress and a number of systems like Coppermine Image Gallery, PHP Fusion, vBulletin etc. The script also supports almost all the major browsers.