Privateer - using this system you can decide how much (if any) goes to THQ, how much goes to Humble and how much goes to charity. You can divide it up however you wish.
Regarding the charities involved:
Child's Play
http://www.guidestar.org/organizatio...39;s-play.aspx
and the rather well known - American Red Cross.
I totally respect the choice to give when only the charity is legit. As Platapus noted - both of these charity's have their F990's publicly available.