fandomgivesback is a comm similar to help_japan, help_pakistan, and gulf_aid_now, in that it's about offering fanworks and personal works to others, who instead of paying you for it will donate money to charity instead. Instead of being for a specific disaster, however, it will be about keeping up a continuous flow of contributions even when there is no disaster.
I would love to make an offer, myself, but I know that I don't have the time to, with too much to do as is. :( So please go and make offers yourself, help contribute to charity, and if nothing else spread the word! Even if you don't have the time to do any of this, just hit the repost button below and pimp this to your flist, and help those around the world who need it. :)