Quidco have redesigned their website, and one of the ideas I like the most is that they show in real time how many people have registered on the site. It gives a good sense of scale and success of the website, and is implemented nicely.
If you haven’t joined Quidco, I recommend you have a good look.
Basically their business model is that all their referral/affiliate fees are passed back to their customers… i.e. me and you. They take a £5 annual charge, but only once you’ve earned £5 in cashback, so you don’t really lose anything. It turns the tables on sites like moneysupermarket.com and the other price comparison websites, who earn all their money from referral fees (and don’t pass anything on to the customer).