Sources for presentation images

Recently, I gave a talk about "Effective Presentations", giving a short overview how to prepare and hold presentations that offer a concrete gain to the audience.

I mentioned Presentation Zen and slide:ology, my favourite books about transferring insight via presentations, and how they advocate replacing bullet-pointed text by images.

Just in time, Smashing Magazine posted an article about sources for presentation images, so I'll simply spread the link to my participants.