ThumbsUp! is a web based picture thumbnailing program written in perl. Main features include: On the fly creation of new thumbnails - After configuration, all you have to do is copy a picture into the thumbnailed folder, and ThumbsUp will create the thumbnails next time a person views it, Support for JPEG, PNG & GIF, Highly customizable - You can alter everything from the image sizes, to the number displayed, the title & the ability to alter the behavior of the tables & images, Allows user defined html headers & footers, Can display image size, dimension & user defined descriptions, Can be configured to use preexisting thumbnails, instead of the automatically generated ones, and After thumbnails are created, system is quite fast.