HarperCollins sent me a sort of
marketing push poll as an advertisement for a bunch of mystery novels with a free book as the payoff. It starts off with a few general questions, but the rest have you read marketing blurbs about current books and then answer a question about how likely you are to rush out and buy them.
The free books are
Evil Under the Sun by Agatha Christie and
A Duty to the Dead by Charles Todd.
The thank you page has a link for each book and it says that you can only pick one, but I was able to select both. You need to give them a valid email address to send the links to and you need ADE to download the books. The links in the email are completely generic and I almost posted those, but felt guilty at the last second and posted the poll.
I'm assuming that the link to the poll isn't tied to me since it says it's anonymous, but when you're dealing with marketing departments, who knows?