Have you seen http://xpenser.com/ http://xpenser.com/ ? Lets you record expenses from email, SMS, Twitter, IM, iPhone, browser search box, voice (call and say i

Have you seen http://xpenser.com/ http://xpenser.com/ ? Lets you record expenses from email, SMS, Twitter, IM, iPhone, browser search box, voice (call and say it), etc. They also have a full set of APIs. Maybe you could build on top of their system.