This was my first multimedia presentation using a Web 2.0 tool.  I had difficulty at first grasping the use of the tool, only because of my limited skills, it is user friendly and intuitive. Also understanding its many advantages and uses for teachers made me appreciate all that it offers.  What I really like about this tool is that you can create your own presentations but there is a vast library of presentations created by other teachers that you can also use.  You don't have to always reinvent the wheel.  The library contains PowerPoints and virtual reality scenes in many different subjects. It is a free site but you can upgrade for a small fee.