Nice & Simple implementation using CSS for output.
The good thing is, you can add your own text, links, even paypal donate button in the text field.
One problem, it wiggs out when I try to put 1000000 as the goal.
I also had to mod this and add:
at the very end of the module output, to make sure the next module is underneath, not wrapped up next to it. (not sure if this is just my layout though)
I would love to see this use the GD library and create a png, and available as a circle too, with the ability to make the image "cached/saved" upon first view (I have code for this if anyone wants to make this happen before I give it a shot).
Good job though, thanks for your great contribution, it looks great on my site.