- Find free images online - Judy O'Connell's list (check out the rest of her blog too -- great library content from "down under")
- PresentationZen's 10 links to cool, high-rez images. These are mostly science and gorgeous.
My three favorite sites for images for PowerPoint presentations are ...
- Google images
- Flickr (there are some great shots here which nicely illustrate various points about reference that I like to make; see all images tagged library)
- stock.xchng "free stock photography." What I like about these is that you can enter a term like "change" and find relevant results. Ain't tagging grand?!