Avoid 'death by PowerPoint' by utilizing PowerPoint to visually enhance lessons.
Instead of spending HOURS scanning images, try http://www.google.com/. Once you type what you're looking for, click search IMAGES in the top left corner. You'll have TONS of images at your fingertips. Thanks, Lori, for this tip!
CAUTION: Google finds EVERYTHING related to that word that's posted on-line. You NEVER want to google images with students in the room.