If you sign up at this site (Oxygen), they'll donate a dollar to the Houston Children's Hospital.
The patients of the New Orleans Children’s Hospital have been evacuated to Houston in the aftermath one of the worst natural disasters in US history. Help raise money to assist these children and their families in this very difficult time.
... Oxygen will donate $1 for every person that joins.
I think it's a small effort that makes some kind of difference, so, if anyone wants to, here's the link.