<i>The way it works is, your visitor has a Flattr account that he/she fills with some money each month.</i><p>Unfortunately that is where it falls apart.<p>The fund-raising model that "works" for Wikipedia is very different from the Flattr model. And I am not convinced that the Flattr model can scale up to the Wikipedia level.<p>(not to mention the fact that donations would be a lot more random, difficult to track and will come in fits & spurts; which is basically useless when you reach the levels of money the WMF is after)<p><i>If wikipedia adopts Flattr as their micropayment solution, overnight tons of people will open a Flattr account. </i><p>I do not think this would happen as easily as suggested.