I've been uploading my PowerPoint Presentations into slideshare:
Last year I did 62 presentations in 45 weeks so this year I've been taking a bit of a break! Sorry folks!
My most popular talk was one I gave to the public in Sydney called 'The making of our Digital Nation' which you can view on Youtube: http://www.youtube.com/user/TroveNLA#p/f/1/a19icvJO_HE It's rather long at an hour and 18 minutes! I very much enjoyed this talk because usually I only get to talk to librarians.
My most recent presentation was to librarians in Spain and called
'Collecting, sharing and improving data: Changing roles for librarians and users.' I drew on my personal experience over the last 25 years and particularly talked about Australian Newspapers and Trove. You can see it on Vimeo: http://vimeo.com/23614929. Again rather long at an hour!