Full disclosure: I'm involved with BzzAgent who supply me with the opportunity to experience products or services that I then talk about with others. There's no pressure to sell - they are more interested in honest opinions, so if you like the idea of it, you can sign up too
I've helped with a few campaigns through BzzAgent : Sacla pesto, Shell V power petrol, but my favourite was to sample and talk about Seeds of Change chocolate! I've just been invited to join a campaign about Splenda. Maybe they are telling me that my enjoyment of the chocolate is noticeable?
I don't take sugar in tea or coffee so I will be asking others to sample the sweetener, but I am looking forward to trying the granulated sweetener in baking. I think that the knitting group will have to sample my wares and tell me their opinion