There's flattr, but they never really took off (not many accept their payments).
Each flattr user sets how much they want to pay per month. Flattr collects the fees, and tracks which sites you visited (or which you click a button on). At the end of the month, they divide all the user's contributions between the sites visited in proportion to the numbers of visits (less a fee for themselves).
Each flattr user sets how much they want to pay per month. Flattr collects the fees, and tracks which sites you visited (or which you click a button on). At the end of the month, they divide all the user's contributions between the sites visited in proportion to the numbers of visits (less a fee for themselves).