Hi have you seen the site btcsatoshi.com? At the upper right corner of their has a donation button which displays the current donation for that particular bitcoin address.
Although it has no progressbar atleast the donations are transparent. It also display the number of donations for that BTC address.
Anyway it looks free and powered by the site coinwidget.com . Give it a try
I'm looking for a quite simple bitcoin-based donation service that would keep track of the $USD sent to a particular address/wallet and display that on a private url page.
Does anyone know if such a site exists?