authorSTREAM

authorSTREAM is a powerful online presentation sharing engine that not only allows you to upload your PowerPoint presentations online for free, but also assists you to share them with your friends, students or co-workers located across the globe. authorSTREAM is a great online community that gives you access to numerous presentations on varied subjects uploaded by community members. You can find exciting presentations on just about any topic, rate them, post a comment and even embed them in your blog.