There is a micropayment service called flattr which is becoming popular in Germany right now. The website is
http://flattr.com/.
Flattr is based in the UK and runs in Euro, but maybe there is way to pay in US-Dollars, I don't know. I just posted the link if someone is interested in creating an exchange service via flattr.
It should be easy to create and manage a flattr account, but the whole thing works with some delay and they take 10% fees.