Online Busking Boxes
People can click to donate directly to artists they want to support, on the artist's own pages, without having to visit a third party website.
Artists of all kinds (visual, musical, theatre, writers, comedians, film-makers, architects, whatever) can sign up to have a "Support Me" type button on their own websites and/or online profiles (youtube videos / blogs / fan pages / Vimeo / Facebook / MySpace, music streaming sites, other profiles/pages etc.). People who like their work can click on the support button to easily give money to the artist to support them.
It would transfer money using a system like Paypal (maybe Paypal itself) directly from the supporter's bank or paypal account.
At least 95 - 99 % of the support money would go directly to the artist.