Thanks to David Orban I discovered Omnisio and so I took a chance to merge my slides with the video Gianandrea recorded during my sci(bzaar)net presentation.
Using Omnisio is very easy, you just provide the URL of a video online and the URL of slides on slideshare.net and then you can optionally synchronize slides with video by drag and drop.
You can see my video/slides on omnisio or embedded here below. Slides are in English but I spoke in Italian.
Share and annotate your videos with Omnisio!