Remember to donate to org's who are supporting Katrina victims. It's the best way to help.
If you want to remind someone to donate say -
text 'redcross' to 78247
text 'umcor' to 78247
A Soflow forum is asking for those you can to donate ad space for organizations who support victims of Katrina. (I think you have to be a member to access the forum). If you're not a member - visit redcross.org to get banners for your site.