At KDE we're trying to get people to donate more (I hope I don't have to explain to this audience why), one of the ideas floating around is adding a small "impulse donate" button to kde.org similar to the one at http://www.videolan.org/ (only with euros and without a "why?" link for now)
I'm not a web devel by far (though have done my fair share of copy&pasting php, html and css for KDE and other personal projects) but I understand it should not be "that hard"™, it would be basically doing some modifications of the kde.org sources, the capacity framework and doing some reuse of the existing paypal donation page code.
Anyone up for the work? If so, please contact me!