Reading your first sentence, I thought, ‘what?… oh, dear!’. But showing a shot of a website when there’s no Internet connection is one of the VERY few circumstances when I do think a PowerPoint presentation is worthwhile and not a lot of work to prepare something that will either send the audience to sleep or distract them from what you’re saying. Would be good to give them a one-page paper handout with a list of urls too, I should think – waste of paper, I know, but waste of your time and knowledge if you give them lots of info and they can’t find the links afterwards – or perhaps you’ll be posting these to an online newsletter or list-serv?