Double Your Money
If you haven't donated to help victims of Katrina yet, consider making a donation to a company that will match it. If you give $100 to the Red Cross, they get $100. If you give it while shopping at Lowe's, the Red Cross gets $200.
You don't have to shop at Lowe's, though. The Red Cross maintains a list of companies that are donating and offering matching programs, but there are many others. Check with your employer, too. My company is matching all employee donations dollar-for-dollar, and we learned today while out shopping that Whole Foods Market will, too.