The S5 Box can be demo'd by clicking on either the Login or Register buttons found towards the top of this page.
The plugin allows for up to 10 different S5 Box's on one page all via 10 widget positions. You simply add a class to any HTML element on your site and enable the corresponding box and you are good to go!
The S5 Box runs off of the core WordPress jquery library so there will be no conflicts with third party extensions or extra javascript files to download.