I bought a metal reward chart from Next a few years ago- this comes with magnetic stars and a pen so you can change the tasks every week or so.
With my 7yr old I use it for him to brush his teeth properly, feed his rabbit, make his bed etc - then I change it to suit him depending on what area he needs to focus on. I set him a challenge to collect different amounts of stars a week for a treat - the higher number of stars the higher the reward.
I find it really motivates him and makes him more indepedent (sp?)
http://www.next.co.uk/shopping/homeware/childrensroom/41/3