My DD is 3.5yrs old and helps me with certain things. ie. She takes all the washing off the clothes racks on the verandah and sorts it into pilees of daddy's, mummy's and her clothes. I fold them and put them away.
She also helps put things away from the washing up once it is dry (but this is donw with DH or myself present).
Helps us take the recycling out to the bin and today she brought the red bin up from the driveway as I bought the yellow bin as it was bin nightlast night. She loved doing that job.
She also gets the mail when we get home in the arvo.

All of the above things she LOVES to do, but try getting her to clean up her toys... NOT A CHANCE! She is hopeless unless she sees me throwing them out because I have asked too many times!