Just like many among us, I had the need for a lightbox-like library to use for a website I was working on. After examining libraries such as Lightbox, Lightbox2, LightWindow, Highslide, Thickbox, ModalBox and many more, I haven't found one that really suited my needs. Either the installation was to complicated, they aren't unobtrusive because you have to mess with the HTML code, the appearance isn't that slick, the transitions were glitchy, conflicts with other libraries occured or the possibilities were lacking.
Enter TopUp! The installation of TopUp consists of including only one file (no images or stylesheets!), the look-and-feel is Apple-like, the animations and transitions look fancy, you can still use Prototype, it is so easy to specify options and last but not least: you can stay updated with the latest version without changing any code. Great for expansions and bugfixes!