Really, the best way to find out what's going on with relief efforts you can help with is to follow cleolinda . She lives in the affected area and she's posting updates and links as she gets them.
Texting "redcross" to 90999 will add a $10 donation to your cell phone bill if you're in the US. When I did it I got a reply asking if I wanted it to go to Japan or to the general disaster fund. Donations to the general fund will help Alabama.
Amazon is doing something really practical and amazing.
Christian Service Mission has submitted a wish list of needed items (food, toiletries, baby care, etc) If you purchase an item it will be sent to them. This way your money can go to exactly what someone needs. There are items that qualify for super saver shipping.