You know it's strange, I don't really browse videos on YouTube or photos on Flickr, but I do find all sorts of stuff of interest on SlideShare. I guess because I am an information junkie.
I found a great presentation Services 2.0 dans les bibliothèques vers des bibliothèques 2.0 ? that covers the various aspects of integrating your library into web browsers and into other web sites, as well as improving your own library site.
The author of the presentation blogs at BibliObsession.net. It's in French. Be warned there are some possible NSFW images there.
(If for some reason you're interested in the discovery chain, it was via Mediapolis who favorited my Web 2.0 presentation, to the presentation Blogs et wiki : outils et phenomenes - it was third in the "related slideshows".)