I seem to recall a thread here about charitable contributions added to hotel bills. (I think there was an earlier one -- but here's a thread from May: http://www.flyertalk.com/travel/fttr...ML/010330.html )

I make personally significant gifts to causes I believe in throughout the year. But I don't let other people make those decisions for me -- especially for a charity I'm not familiar with (how effective is the charity? who knows!)