http://charlesleifer.com/blog/nginx-a-caching-thumbnailing-reverse-proxying-image-server-/

• nginx
• caching
• thumbs
• thumbnails
• reverse
• proxy
• image

http://dtbaker.com.au/random-bits/website-screenshot-thumbnail-creator-script.html

• screenshot
• website
• thumbs

http://www.phplinkdirectory.com/articlescript/Screenshot_Processor_Released.php

• screenshot
• thumbs
• thumbnails
• batch
• database