Digital Images
A Flickr Badge!
Visual literacy is fast becoming a vital part of our educational environment. Fortunately, web-based photograph management systems are easy to use and make digital images very accessible!
Flickr is probably the most popular site. Below are some "how tos" to help you get started in using, understanding, and having fun with digital photos in your classroom and your life! 
Online Photo Sharing with Flickr.pdf
Sharing Photos Online (19 minute screencast)
http://www.youtube.com/watch?v=vPU4awtuTsk
Other resources:
Photo Sharing in Education from Teaching Hacks.com wiki
Using Fastr and Flickr to teach vocabulary
Search for Creative Commons photos via FlickrCC
Using Flickr to explore trignometry - really!
Geotagging with Flickr
and most importantly, HAVE FUN!