I like using Ebates for items I had already planned to buy on the internet anyway. Just last week I bought a cool folding footrest for traveling on the plane this summer. I went through Ebates and got it from Magellan's. I received 5% cash back and $5.00 for being an Ebates promotional purchase (Ebates gives you deadlines for some promotions to make a "qualifying purchase." This was for "first purchase;" however, more like my third! ) :-)
P.S. I have earned $16.94 thus far on Ebates since joining in March.