I thought that I had joined just about every rewards program known to man.  Some of the ones that I am currently a member of are:

Mypoints--This program has been around for a while and has stood the test of time.  I have earned more gift cards than I can remember and used them to pay for more stuff than I probably need.  It is simple and straight forward.  Every day you are sent several promotional emails from their clients.  When you read an email you get 5 pts.  For around 3500 points you can cash out for a $10 gift card.  If you aren't a member and decide to join--I would love to have the referral (desiab at yahoo dot com).

BzzAgent--This program allows me to try a lot of the new products introduced to the market.  I receive brand new merchandise free of charge.  The company asks that if I like the product I tell all of my friends and family.  Usually a bzzkit will also include lots of coupons to share.  The neat thing about this program is that once you complete certain activities, you are rewarded with Mypoints!  So if getting new products sounds like something you want to do then sign up.  Again I would love it you told them I sent you by using my email address:  desiab at yahoo dot com.

Rewardtv--If you like watching tv and love trivia then this reward program is a perfect fit.  We all have our favorite television shows.  Well rewardtv rewards you for watching them.  Once you watch your favorite show go to rewardtv and answer the trivia questions.  Each question answered correctly gets you points.

Swagbucks is one that I recently discovered.  So far I have heard glowing recommendations about this program and I think that you will enjoy being a member as well.