S5 is the Simple Standards-Based Slide Show System created by Eric Meyer and released to the public domain. In short, it's a presentation system based on open web standards that anyone can use in any modern web browser.
There's a lot of room to improve S5, to standardize implementations and incorporate new tools introduced since S5 was last updated (e.g. HTML5, jQuery UI). If you’d like to get involved in shaping the future of S5 itself or S5project.org, please join the Google group and/or the S5 Project wiki, and share your ideas.