Best jQuery Plugins all in one place. BBQ: Back Button & Query Library Source: http://benalman.com/projects/jquery-bbq-plugin/ Leverages the HTML5 hashchange event to allow simple, yet powerful bookmarkable #hash history. In addition, jQuery BBQ provides a full .deparam() method, along with both hash state management, and fragment / query string parse and merge utility methods. ColorBox: Lightbox
Check out Cycle2, the latest in the Cycle line of slideshows. The jQuery Cycle Plugin is a slideshow plugin that supports many different types of transition effects.