Are you looking for an easy way to share presentations online? Then check out SlideShare.net. With it you can embed slideshows into your own blog or website. You can also sync audio to your slides and make shows public or private. 
Here's how:
- Uploading Your Presentation – It can be a PowerPoint, OpenOffice, Keynote, or PDF file. Your presentation file should not be password protected and be sure to remove any macros. Not all fonts supported (but you can convert to PDF). Be sure the file is less than 100MB.
- Converting Your Presentation – The second step is converting the file to SlideShare’s sharing format. Once uploaded, the file is placed in the conversion queue (this might take a while). You can leave the page and come back later... If there was an error you will need to go to the
“My Slidespace/Edit All” to find the files that were not successfully converted. - Creating a Slidecast– Slidecasting is a multimedia format from SlideShare. Any slide deck can be synced with an audio file.
- Put it all Together – Use the synchronization tools to mix audio and slides.
- Publish the presentation.