"If you haven’t already registered your domain with Readability, you have until July 15, 2012 to do so."

They love to give money away, but a.) do not link to the page where to register or tell how to register b.) The signup page only caters to readers c.) The publisher page does not show how to register.

If you search the page, you will find a link buried beside others called "Register"

IMHO that is not the way to have millions of sites to register.

UPDATE: Registered for http://codemonkeyism.com Now I get $0.18 - Wohooo! Didn't know before that they wanted to give me money. The model seems nice, easier than Flattr but when reading about Readability (and I'm a InstaPaper payer) I thought the model was only for big publishers, not small blogs like mine.