We were chattering about having Stephen Hawking do a funraising banner (Trevor made up one), and speculating how well they'd do. You could even serve up diffferent banners based on the categories. If it's a page about physics, serve up the Hawk banner. If science fiction, Charles Stross or whomever else. If they visit the Angelina Jolie page, they get to see the Angelina Jolie banner. Who knows?? Maybe we could make it COOL to have a Wikipedia fundraising banner, just like it was COOL to be a guest on the Muppet Show, or it's COOL to have your own animated character on The Simpsons. I'm thinking that a short video clip like "I'm Freeman Dyson and I want you to support wikipedia.".
Seems like something that could easily be tested.