http://prezi.com/login/

Prezi is a cloud-based presentation software that opens up a new world between whiteboards and slides.
The zoomable canvas makes it fun to explore ideas 
Public

Create an account for free. With a public account, your prezis will be publicly viewable, searchable, and reusable.

http://www.boxoftricks.net/2009/05/top-five-online-presentation-tools/

These are five of the best web based applications that allow you to create and share presentations online

http://www.lakeshorebranding.com/company/blog/compiled-list-of-the-top-online-presentation-tools-and-apps-today/

Compiled List of The Top Online Presentation Tools and Apps Today
On April 27, 2010