I've just discovered via @dkapuler a post from the fantastic blog Free Technology for Teachers a site which allows you to transform a pdf file into a slideshow which can be embedded online.
SPEAKERDECK - http://speakerdeck.com
We use the Promethean E-board at the school where I teach and a way to share the files we use during our lessons would be to export it as a pdf. The possibility to turn it into a slideshow is more visually appealing, I guess.
* I still haven't found a way to diminish the size of the player.