Lately the big stir is services such as Review Me which connects advertisers with bloggers who in turn write reviews of their products in exchange for cash.
Personally I don’t like the idea of paid reviews. It create bias. As long as it is noted in the review it is paid I guess it is a good deal for the bloggers but I still do not trust it.
Review Me puts a nice touch to their service that allows the review to be positive or negative and allows the blogger to still be paid, which I think helps to clear any bias reviews.
I still think you should write about products you like because you like them and not because you are getting paid. On another note if you would like me to take a look at your product/service and have the chance that I may post about it for free, let me know in the comments.