A lot of people do the sign ups that do not require a credit card. Then there's the daily survey which is worth 80 cents. If you don't qualify for the first daily survey, you can keep trying until you do get one. There's also the shopping portal that will get you a different percentage back, depending on the merchant.
Check out SR's own forum for more help. I'm also going to move this over to the Disney Rewards Board so that you can get help from DISers who do SR successfully.