Several newspapers and bloggers (see jill/txt) in Norway have been writing about young bloggers "making millions" on advertisements and hidden marketing in their blogs, getting paid to mention brand names. Damn! I could have been stinking rich now, from pushing all those Robert Wyatt albums, but just as I see the possibility, I realise it's not fair play (and probably strictly forbidden).
I'm not against marketing and I'm not against making money, but I think the beauty of the internet is the possibility to share and cooperate. The more blogs without advertising, the better.