A while back this blog featured a minor rant about why one shouldn’t hand over one’s powerpoint (or keynote) files to the conference organiser. On the grounds that it’s nice to have one’s prejudices confirmed, but maybe more because this is a wonderful masterclass in making slide-based presentations, this Authors@Google video, “Presentation Zen” by Garr Reynolds is highly recommended! Warning: settle in; it’s an hour long. (Thanks to Fred for sending this link.)