Sharing presentations online is something needed by many educators or businessmen who need to share the material with other people. Today you can share about anything, including your social life, your work, and why not your presentations.
In order to share presentations online we have the traditional methods to accomplish this with Slideshare and Authorstream, but there are many other services online that let you share presentations in PDF and PowerPoint with a community or your circles.
With Projeqt you can share your presentations and pull your live tweets or blog feeds, insert an interactive map, add audio notes or stream videos. This online service let your presentations be as dynamic as you are.
Youblisher is another free alternative where you can -within minutes- turn your magazines, catalogs, business reports, presentations and all other PDF documents into publications with flippable pages.
Slideonline.com is another great free service where you can upload and share presentations online. Slide Online let you upload PDF and PPT presentations and automatically are converted to an online version. Then you can share the link with your colleagues or just embed your powerpoint presentations in a blog.