Resources - Clipart
Discovery School recommended
Microsoft Design Gallery
ESL Clipart - good images for teaching English vocabulary
CASLT Clipart - large collection of various categories
Web Clipart
Anne's School Days Gifs - cutesy, school related
Teacher Files - free teacher clipart
Kaboose Clipart and Icons
Jason's Animated Outpost - collection of animated clipart
Teacher's Guide

Resources - Digital Photos
Pics4Learning recommended
Art Images for College Teachers - images of artwork
FreeFoto - not specific to education but free to use
NYPL Digital Library - searchable collection
istockphoto - for purchase only, but a wonderful collection

Downloading Clipart
Modifying Clipart