I was reading a parenting book a few months ago, and it said that if your child wants to help with house work, yard work, or whatever, to let them do it and then to not go back over it once they are done.
My little man has started to help me clean around the house... BUT I was surprised when he wanted to vacuum. I was a little hesitant, but I want him to help and I want him to learn to be better, so I let him. Both of us were so proud that he did it all by himself!!! MAN, I can't wait for him to load the dishes =)