I got an email from them a few weeks ago also and, like you, i questioned the reasons they wanted a user/pass so didnt bother sending one.

Typically, if i want to get my sites reviewed, ill contact the site directly and ask for a review.

I do think this is a way that could become the 'join a sponsor' scam that surfers used a few years ago where they would sign up for an affiliate program just to rape all the free content the program gave to its affiliates.

Regards,

Lee