I can confirm that asking permission when we find a photo we want to use in a presentation is easy. Also, I had to prepare a couple of presentations for the recent ILCA conference, and learned to deeply appreciate the following sites, which have oodles of good free pictures. Many were licensed under Creative Commons:

http://search.creativecommons.org/
http://www.rgbstock.com/   The RGBstock license is here:  http://www.rgbstock.com/license
http://commons.wikimedia.org/wiki/Main_Page (click on Images if you're looking for a picture)

Hope that is helpful....

Regina Maria Roig-Romero, BS IBCLC
Miami FL

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