Authorstream is an interesting way to quickly get your PowerPoint presentation online--without going through the fuss of saving it as html, and then mounting all the pages and files to a Web page.
I created a wiki for my presentation at TESOL on CALL and SLA research, copied it to PowerPoint slides, and then uploaded the resulting ppt to my Authorstream page. If there were video or audio attached, AuthorStream would convert the file to a YouTube format. Mine is just a slideshow.
UPDATE: Thanks to all who visited the slideshow. I now have the audio uploaded to both AuthorStream and Ourmedia.org.