I've signed up for a few newsletters on purpose before, if (a) the product and/or content was compelling enough, and (b) the checkbox told me unambiguously what

I've signed up for a few newsletters on purpose before, if (a) the product and/or content was compelling enough, and (b) the checkbox told me unambiguously what the newsletter would contain, and most importantly, how often it is sent (monthly is ideal). Assuming your newsletter might be something your users would actually want to read (crazy, I know), the newsletter preview link is a fantastic idea.