Robin Good: Rvl.io is a new web-based presentation tool, that makes it as easy as possible the creation, editing and publication of a slideshow.
Rvl.io, which is free to use, allows you to format slides, select the type of transitions, and to integrate text, images and links. All presentations are set by default to private, but can be easily made public in one click.
Video intro: http://youtu.be/LyWAc7dBvmA
Try it out now: http://www.rvl.io/
P.S.: Beware. The service is in beta. I have had some issues in upload and displaying images inside slides in my tests.
Via Robin Good, Maria Margarida Correia