We'd like to encourage everyone to give what they can to help those affected by hurricane Katrina. You can give to organizations such as the Red Cross, Habitat for Humanity, the Salvation Army, or a number of other relief organizations. Give.org has a larger list of charitible organizations involved in hurricane releif.
There are some specifically LEGO-ish opportunities to give. For instance, there are several auctions that have been set up with proceeds going to relief efforts. More will come up in the days and weeks to come, and we'll note them here as they do.