Some advertisers offer multi-tier programs that distribute commission into a hierarchical referral network of sign-ups and sub-partners. In practical terms, publisher "A" signs up to the program with an advertiser and gets rewarded for the agreed activity conducted by a referred visitor. If publisher "A" attracts publishers "B" and "C" to sign up for the same program using his sign-up code, all future activities performed by publishers "B" and "C" will result in additional commission (at a lower rate) for publisher "A".
I loved seeing the example of the Kids Tablet with Wifi utilizing affiliate marketing. It gave me some great ideas on integrating amazon for my own children’s blog. I would be interested in knowing how much they are earning monthly from their affiliation. Being a mother of a two year old myself, I could see myself writing reviews on Amazon products my daughter enjoys.