I would like to bring two interesting websites to your notice.
The first one is called SciVee and is a joint offering of the the Public Liborary of Science (PLoS), the National Science Foundation, and the San Diego Supercomputing center. It allows scientists to publish papers and also to upload presentation videos that provide a guide to their work. It has been called a YouTube for scientists.
Explore SciVee here.
The second website called, nanoHUB, is devoted to nanotechnology and provides many resources to help people learn about it. It uses Web 2.0 technlogy to provide online presentations, animations, simulation tools that you can use (after free regsitration), and much more.
nanoHUB can be accessed here.