The Nectar Search Toolbar is a free and safe application that sits on your Internet browser and offers you useful and engaging features. Including issuing Nectar points for web searches and purchases. You can collect Nectar point from over 500 on-line retailers including British Gas, eBay, Amazon, Argos, Play.com, o2, Apple iTunes, and Dixons. Also you can collect 1 Nectar point per 2 valid searches you make on Yahoo (maximum of 50 Nectar points per month).
Buggy, doesn't work with firefox, despite claiming it does, and stops counting searches after 15 or so in the month (max is 400)
If you don't mind contributing to mass behavioural datasets (which I don't) then the points were a good bonus, but the thing has stopped working for me, and no-one seems to acknowledge there is a problem.