Once you build a widget like a slide show, you can easily insert it into an article, blog post, or custom module. And better yet, you can have multiple slide shows, tabs, accordions, etc on a page (many slideshow don’t work if you put more than one on a page).
In addition to all the great widgets, WidgetKit includes a media player that plays HTML5 video and audio. What’s more, it has a backward compatible flash player so you can accommodate users with browsers that don’t understand HTML5 video and audio. This is a very important feature since all of your iPhone, iPad, and iPod users require HTML5 video: they can’t play flash video.
I highly recommend WidgetKit from Yootheme; it has become a standard extension that I install on all Joomla sites I build.