Starlight has a program whereby you can cash in Hilton HHonors points for a cash donation to Starlight. For 10,000 points, they will donate $25. Might this be any different since you are donating something which equates into a tangible, quantifiable cash value? Or does Hilton just get a deduction?
http://www.starlight.org/intl/helping/hiltonhonors.htm
cnk