I like Milesource very much, and that might be because I just cashed in for $100 in Chapters gift certificates.
Milesource is a site where you can earn points, which you can then exchange for gift certificates or travel credit. There are many choices of gift certificates available, both online and off line, and you can also cash in for Flooz if you prefer.
So, how do you earn these points? Milesource has quite a few ways to earn, including visiting websites once every 24 hours, shopping, trivia game, contests, and referrals. You continue to make money when your referrals use the site.
The site is easy to navigate and has lots of information and shopping possibilities. It does take some time every day, but I think the payoff is worth it.