Create your own movies!
There is an awesome flood of online services to create various medias. You can of course create PPT using slideshare and other tools. Here are couple of other innovative ways to add your multimedia: http://prezi.com/ - Creates ppts in form of zoom out and zoom in whiteboard. Conventional ppts are on queue based model, whereas this guy provides you stack based model to put up your thoughts online. e.g.: http://www.xtranormal.com/ - Create your own animated flash movies. How awesome is this! It provides tons of customizable options and you can embed those movies on your webpage just like any other flash video from youtube, etc. e.g.: Create cartoons from http://www.toondoo.com/ E.g.