Our echo_bat.module allows you to have a dynamic PNG image representing progress on a fundraising or membership goal akin to the "bat" used on the Dean campaign.
Here's an example from Fight Hunger: Walk the World:

The image, text on the image, and HTML text around the image can be dynamically produced for a website as a Drupal block.
Features
Features of version 0.2 (released 10/7/05) include:
- Drupal admin configuration of settings (screenshots: one two three)
- web-based uploading of source images
- TrueType text with configurable placement, font, and size
- web-based configuration of pixel coordinates
- displays dollars and cents
- dedicated user permissions for bat admin
Future features for the open-source release include:
- optional cron operation
- multiple bats per site
Download
Contact
For more information, contact Justin Miller at jmiller@echoditto.com.