tipjoy for your tumblelog
Tipjoy is working in a beta partnership with tumblr to help their users earn money from their tumblelogs.
We've got a new custom button on a few tumbelogs. The UI is completely customizable via CSS. The widget shows recent and most generous tippers.
Here are a few great examples:
We'll be making this custom code available to anyone for any site very soon. In the meantime if you'd like an advance copy of the code, email us at: founders[at]tipjoy.com