writes "Kyle at HardOCP has an editorial on the ethics of strongarming review sites."
Its a wierd story and you'll have to read the links to get the full history, but essentailyl nVidia appears to be muscling sites out of posting reviews of competitors cards in exchange for demo cards. Its a bit odd and full of all sorts of he-said she-said so read it and sort it out for yourself. Similiar opinions can be read at Hypothermia
, and Insane Hardware
if you want a 2nd and 3rd opinion.