McLean's magazine reports:
In late 2004, Marqui, a Vancouver (BC, Canada)-based communications firm, introduced its Blogosphere Program, through which it recruits influential bloggers who commit to mentioning Marqui's clients on their sites in exchange for CDN$800 (about US$666) a month. So far, 15 have signed up.
The Globe & Mail notes that:
Hip-hop artists could receive royalties from McDonald's if they mention the Big Mac in their lyrics.
This is like product placement in movies. The difference from blogs, at least technical ones, is that lyrics and movies are about events and emotions, so it's easy to note when products are placed in them. When a blog, like this one, talks about products, who's to know if I've been paid or not?
(I get paid through the ads that run on the sidebar. But I don't know what the ads are, because the editing function of Typepad is independent of the viewing function. I don't visit my own blogs.)