Robin Good: SilkSlides is a web-based platform that offers an alternative to Slideshare by providing an ad-free, clean interface, an easy and straightforward way to upload any PPT or PDF file, and a dedicated URL cum discussion space where your readers or colleagues can contribute and comment your work.

 

Slides can be viewed in full-screen mode and presentations can be downloaded - if allowed - by readers.

 

Free to use.

 

More info / Try out immediately: http://silkslides.com/

 

Via Robin Good