I'm currently working with a group at ITP on an application to get micropayments for charity. We've called it givkwik, it leverages "impulse philanthropy". I'm doing the frontend dev and some backend/database work. We're using AJAX, php/mySQL, and jQuery, with a healthy dose of semantc markup and styles. Web 2.0 ftw!

update 7.5.09: GivKwik on Mobile Behavior