Sort of a YouTube for presentations. A great place to borrow from others and add on or edit the work they've already done. Also a great place to share important work you've done.
This site is similar to prezi. It is a new/better version of a PowerPoint. Teachers can use Eduslide to deliver elearning modules to students inside and outside the classroom. Modules can include multiple lessons with text, slides, flashcards, links to other sites, audio, and video.