I am signed up for  lot of them but have personal favorites because some of them take up too much time. Most wont get you a lot of money but I like the easy ones where you click and they add up to gc's. I've been doing Mypoints for about 8 or 9 years. You get points for clicking on there emails or for buying things. I've never had a problem with getting the gift certificates. http://tinyurl.com/26kfov8

 I also love swagbucks. I get Amazon.com certificates because they give you the most bang for your buck. You put their toolbar on your computer and swagbucks for searches. http://tinyurl.com/2385vfa