Rewardfox.com

Good cashback site. Easy navigation and has hundreds of shops to choose from. Most pay 100% cashback.
No fees or high cash out levels. Reach £5 and the money's yours and they pay out fast.
Newsletter pay 10p for every email.
Good daily click throughs that help top up your account.
I always use reward fox for cashback on dvds as it clears within days and payment is quick.
Got £170 when getting a £15 contract at mobiles.co.uk. £30 from reward fox and the rest from mobiles.co.uk.