Although it is a worthy endeavor to have a charity accept bitcoins, the Red Cross isn't one of those charities. There are many more worthwhile charities to be focused on. Maybe this idea should be expanded to something along those lines?
Name one.
Convoy of Hope. There one.
But here are a few others: Direct Relief, Young Life, Samaritan's Purse
Don't get me wrong, Red Cross is a very solid charity (although financials tend to hover around the second quartile rather than the top quartile). When I say worthwhile, it's more implying that there are charities that would benefit much more from an organized transactor gateway in bitcoin.
I feel that setting up the Red Cross for this would lose some of its worth because of the size of the red cross. Focusing on smaller gateways that can serve multiple charities would be significantly stronger in my opinion.