I love, love, love Shopkick. I am constantly getting free gift cards. You earn "kicks" by looking at look books, scanning barcodes of items in the store, and at some stores just for walking in. These kicks can be redeemed for gift cards and other prizes. Just go to http://get.shopkick.com/wedge5118 to sign up now!
Disclaimer - This post contains my personal referral links.