I have collected some useful opinion and position statements from social software early adopters, who have gained reputations in educational technology over the last decade. These are worth noting since inevitably they bring a practical perspective to the use of new applications in teaching.
Most days, I spend up to an hour using google reader to identify new developments especially new uploads to slideshare.
I have set up a favourites list and a dedicated group, named "web 2.0 tools in effective learning". The number of relevant slideshows expands each day with educators and enterprising types around the world sharing their work. No real need to develop anything new for presentations any more.
Browse to see the possibilities: