Sorry for the link bait title. The amount of quality stock photos (free, no attribution required, do whatever you want) is growing very rapidly. I am using more and more of them. Just run this Google search and see for yourself.
Click "view post" to read the full blog entry. If you liked this post, why not subscribe to daily updates about presentation design via email? Just blog posts, no spam. You can find Jan Schultink on Twitter here.