Just in from the mailing list:
“Yesterday, iGoogle launched “Themes for Causes” with One Laptop per Child as one of their first 25 causes. “Themes for Causes” are ways to customize your Google homepage to show your support.
Show your support for One Laptop per Child by adding our theme to your Google startpage, and by sharing the theme with your friends. As more people use our theme, it is rated more highly and more people see it.
I’ve enabled it on my account.. and i’ve most certainly seen nicer themes, I have to say. Still, a cool way to show support!